diff --git a/docker-compose.prod.yml b/docker-compose.prod.yml
index 22536ac..5b074b2 100644
--- a/docker-compose.prod.yml
+++ b/docker-compose.prod.yml
@@ -17,7 +17,7 @@ services:
       # Use Redis for token storage
       - REDIS_URI=redis://redis:6379/0
       # Use PostgreSQL for database
-      - DATABASE_URL=postgresql://baby_monitor:securepassword@postgres:5432/b
+      - DATABASE_URL=postgresql://baby_monitor:securepassword@postgres:5432/baby_monitor_db
     command: ["--host", "0.0.0.0", "--port", "8000"]
     restart: unless-stopped
     depends_on:
diff --git a/src/baby_monitor/main.py b/src/baby_monitor/main.py
index 0d45a8b..33f73ee 100644
--- a/src/baby_monitor/main.py
+++ b/src/baby_monitor/main.py
@@ -14,6 +14,7 @@ from baby_monitor.routers.auth import verify_token
 from baby_monitor.routers.admin import router as admin_router
 from baby_monitor.routers.child import router as child_router
 from baby_monitor.routers.feeding import router as feeding_router
+from baby_monitor.routers.diaper_change import router as diaper_change_router
 from baby_monitor.routers.health import router as health_router
 from baby_monitor.repositories.dependencies.get_database import init_db
 
@@ -51,6 +52,7 @@ app.include_router(auth_router)
 app.include_router(admin_router)
 app.include_router(child_router)
 app.include_router(feeding_router)
+app.include_router(diaper_change_router)
 app.include_router(health_router)
 
 
@@ -97,6 +99,12 @@ def serve_feedings() -> FileResponse:
     return FileResponse(static_path / "feedings.html")
 
 
+@app.get("/log-diaper.html", include_in_schema=False)
+def serve_log_diaper() -> FileResponse:
+    """Serve the log diaper change page."""
+    return FileResponse(static_path / "log-diaper.html")
+
+
 @app.get("/api/")
 def read_root(token: Annotated[str, Depends(verify_token)]) -> dict:
     """API root endpoint (requires authentication)."""
diff --git a/src/baby_monitor/models/db/diaper_change.py b/src/baby_monitor/models/db/diaper_change.py
new file mode 100644
index 0000000..66daa56
--- /dev/null
+++ b/src/baby_monitor/models/db/diaper_change.py
@@ -0,0 +1,30 @@
+"""Diaper change database model."""
+
+from typing import TYPE_CHECKING
+from sqlalchemy import Column, Integer, DateTime, ForeignKey, String
+from datetime import datetime, UTC
+
+if TYPE_CHECKING:
+    from sqlalchemy.orm import DeclarativeBase
+
+    Base = DeclarativeBase
+else:
+    from baby_monitor.repositories.dependencies.get_database import Base
+
+
+class DiaperChange(Base):
+    """Diaper change log database model."""
+
+    __tablename__ = "diaper_changes"
+
+    id = Column(Integer, primary_key=True, index=True)
+    child_id = Column(Integer, ForeignKey("children.id"), nullable=False)
+    change_time = Column(DateTime, nullable=False)
+    poop_amount = Column(String, nullable=True)  # stores PoopAmount enum
+    poop_color = Column(String, nullable=True)  # stores PoopColor enum
+    pee_amount = Column(String, nullable=True)  # stores PeeAmount enum
+    pee_color = Column(String, nullable=True)  # stores PeeColor enum
+    created_at = Column(DateTime, default=datetime.now(UTC), nullable=False)
+
+    def __repr__(self) -> str:
+        return f"<DiaperChange(id={self.id}, child_id={self.child_id})>"
diff --git a/src/baby_monitor/models/diaper_change.py b/src/baby_monitor/models/diaper_change.py
new file mode 100644
index 0000000..ce60860
--- /dev/null
+++ b/src/baby_monitor/models/diaper_change.py
@@ -0,0 +1,46 @@
+"""Diaper change-related request and response models."""
+
+from datetime import datetime
+from pydantic import BaseModel, Field
+
+from baby_monitor.models.enums import (
+    PeeAmount,
+    PeeColor,
+    PoopAmount,
+    PoopColor,
+)
+
+
+class CreateDiaperChangeRequest(BaseModel):
+    """Request model for creating a diaper change log."""
+
+    child_id: int = Field(..., gt=0)
+    change_time: datetime
+    poop_amount: PoopAmount | None = None
+    poop_color: PoopColor | None = None
+    pee_amount: PeeAmount | None = None
+    pee_color: PeeColor | None = None
+
+
+class UpdateDiaperChangeRequest(BaseModel):
+    """Request model for updating a diaper change log."""
+
+    change_time: datetime | None = None
+    poop_amount: PoopAmount | None = None
+    poop_color: PoopColor | None = None
+    pee_amount: PeeAmount | None = None
+    pee_color: PeeColor | None = None
+
+
+class DiaperChangeResponse(BaseModel):
+    """Response model for diaper change log data."""
+
+    id: int
+    child_id: int
+    change_time: datetime
+    poop_amount: str | None
+    poop_color: str | None
+    pee_amount: str | None
+    pee_color: str | None
+    created_at: datetime
+    child_name: str | None = None  # Optional, populated when needed
diff --git a/src/baby_monitor/models/enums.py b/src/baby_monitor/models/enums.py
index 5427f87..593819e 100644
--- a/src/baby_monitor/models/enums.py
+++ b/src/baby_monitor/models/enums.py
@@ -9,3 +9,36 @@ class FeedingType(StrEnum):
     LEFT_BREAST = "left_breast"
     RIGHT_BREAST = "right_breast"
     BOTTLE = "bottle"
+
+
+class PoopAmount(StrEnum):
+    """Enumeration of poop amounts."""
+
+    LIGHT = "light"
+    MEDIUM = "medium"
+    HEAVY = "heavy"
+
+
+class PoopColor(StrEnum):
+    """Enumeration of poop colors."""
+
+    BLACK = "black"
+    YELLOW = "yellow"
+    GREEN = "green"
+    BROWN = "brown"
+
+
+class PeeAmount(StrEnum):
+    """Enumeration of pee amounts."""
+
+    LIGHT = "light"
+    MEDIUM = "medium"
+    HEAVY = "heavy"
+
+
+class PeeColor(StrEnum):
+    """Enumeration of pee colors."""
+
+    CLEAR = "clear"
+    YELLOW = "yellow"
+    RED = "red"
diff --git a/src/baby_monitor/repositories/dependencies/get_database.py b/src/baby_monitor/repositories/dependencies/get_database.py
index 3d1fa83..8b3832b 100644
--- a/src/baby_monitor/repositories/dependencies/get_database.py
+++ b/src/baby_monitor/repositories/dependencies/get_database.py
@@ -79,6 +79,7 @@ def init_db() -> None:
     from baby_monitor.models.db.user import User  # noqa: F401
     from baby_monitor.models.db.child import Child  # noqa: F401
     from baby_monitor.models.db.feeding import Feeding  # noqa: F401
+    from baby_monitor.models.db.diaper_change import DiaperChange  # noqa: F401
     from baby_monitor.models.invitation import Invitation  # noqa: F401
 
     # Ensure data directory exists
diff --git a/src/baby_monitor/repositories/dependencies/get_diaper_change_repository.py b/src/baby_monitor/repositories/dependencies/get_diaper_change_repository.py
new file mode 100644
index 0000000..5616377
--- /dev/null
+++ b/src/baby_monitor/repositories/dependencies/get_diaper_change_repository.py
@@ -0,0 +1,17 @@
+"""Dependency for getting diaper change repository instance."""
+
+from typing import Annotated
+from fastapi import Depends
+from sqlalchemy.orm import Session
+
+from baby_monitor.repositories.dependencies.get_database import get_database
+from baby_monitor.repositories.diaper_change.sqlite_diaper_change import (
+    SQLiteDiaperChangeRepository,
+)
+
+
+def get_diaper_change_repository(
+    db: Annotated[Session, Depends(get_database)],
+) -> SQLiteDiaperChangeRepository:
+    """Get diaper change repository instance."""
+    return SQLiteDiaperChangeRepository(db)
diff --git a/src/baby_monitor/repositories/diaper_change/sqlite_diaper_change.py b/src/baby_monitor/repositories/diaper_change/sqlite_diaper_change.py
new file mode 100644
index 0000000..2bf0f8f
--- /dev/null
+++ b/src/baby_monitor/repositories/diaper_change/sqlite_diaper_change.py
@@ -0,0 +1,133 @@
+"""SQLite implementation of diaper change repository."""
+
+from datetime import datetime
+from sqlalchemy.orm import Session
+
+from baby_monitor.repositories.interfaces.diaper_change_repository_interface import (  # noqa: E501
+    DiaperChangeRepositoryInterface,
+)
+from baby_monitor.models.db.diaper_change import DiaperChange
+from baby_monitor.models.db.child import Child
+
+
+class SQLiteDiaperChangeRepository(DiaperChangeRepositoryInterface):
+    """SQLite implementation for diaper change log data access."""
+
+    def __init__(self, db: Session):
+        self.db = db
+
+    def create(
+        self,
+        child_id: int,
+        change_time: datetime,
+        poop_amount: str | None = None,
+        poop_color: str | None = None,
+        pee_amount: str | None = None,
+        pee_color: str | None = None,
+    ) -> dict:
+        """Create a new diaper change log entry."""
+        diaper_change = DiaperChange(
+            child_id=child_id,
+            change_time=change_time,
+            poop_amount=poop_amount,
+            poop_color=poop_color,
+            pee_amount=pee_amount,
+            pee_color=pee_color,
+        )
+        self.db.add(diaper_change)
+        self.db.commit()
+        self.db.refresh(diaper_change)
+
+        return self._to_dict(diaper_change)
+
+    def get_by_id(self, diaper_change_id: int) -> dict | None:
+        """Get a diaper change log by ID."""
+        diaper_change = (
+            self.db.query(DiaperChange)
+            .filter(DiaperChange.id == diaper_change_id)
+            .first()
+        )
+        if not diaper_change:
+            return None
+        return self._to_dict(diaper_change)
+
+    def get_by_child_id(self, child_id: int) -> list[dict]:
+        """Get all diaper change logs for a specific child."""
+        diaper_changes = (
+            self.db.query(DiaperChange)
+            .filter(DiaperChange.child_id == child_id)
+            .order_by(DiaperChange.change_time.desc())
+            .all()
+        )
+        return [self._to_dict(dc) for dc in diaper_changes]
+
+    def get_by_user_id(self, user_id: int) -> list[dict]:
+        """Get all diaper change logs for a specific user's children."""
+        diaper_changes = (
+            self.db.query(DiaperChange)
+            .join(Child)
+            .filter(Child.user_id == user_id)
+            .order_by(DiaperChange.change_time.desc())
+            .all()
+        )
+        return [self._to_dict(dc) for dc in diaper_changes]
+
+    def update(
+        self,
+        diaper_change_id: int,
+        change_time: datetime | None = None,
+        poop_amount: str | None = None,
+        poop_color: str | None = None,
+        pee_amount: str | None = None,
+        pee_color: str | None = None,
+    ) -> dict | None:
+        """Update a diaper change log entry."""
+        diaper_change = (
+            self.db.query(DiaperChange)
+            .filter(DiaperChange.id == diaper_change_id)
+            .first()
+        )
+        if not diaper_change:
+            return None
+
+        if change_time is not None:
+            diaper_change.change_time = change_time  # type: ignore[assignment]
+        if poop_amount is not None:
+            diaper_change.poop_amount = poop_amount  # type: ignore[assignment]
+        if poop_color is not None:
+            diaper_change.poop_color = poop_color  # type: ignore[assignment]
+        if pee_amount is not None:
+            diaper_change.pee_amount = pee_amount  # type: ignore[assignment]
+        if pee_color is not None:
+            diaper_change.pee_color = pee_color  # type: ignore[assignment]
+
+        self.db.commit()
+        self.db.refresh(diaper_change)
+        return self._to_dict(diaper_change)
+
+    def delete(self, diaper_change_id: int) -> bool:
+        """Delete a diaper change log entry."""
+        diaper_change = (
+            self.db.query(DiaperChange)
+            .filter(DiaperChange.id == diaper_change_id)
+            .first()
+        )
+        if not diaper_change:
+            return False
+
+        self.db.delete(diaper_change)
+        self.db.commit()
+        return True
+
+    def _to_dict(self, diaper_change: DiaperChange) -> dict:
+        """Convert DiaperChange model to dictionary."""
+        return {
+            "id": diaper_change.id,
+            "child_id": diaper_change.child_id,
+            "change_time": diaper_change.change_time,
+            "poop_amount": diaper_change.poop_amount,
+            "poop_color": diaper_change.poop_color,
+            "pee_amount": diaper_change.pee_amount,
+            "pee_color": diaper_change.pee_color,
+            "created_at": diaper_change.created_at,
+        }
diff --git a/src/baby_monitor/repositories/interfaces/diaper_change_repository_interface.py b/src/baby_monitor/repositories/interfaces/diaper_change_repository_interface.py
new file mode 100644
index 0000000..d65b660
--- /dev/null
+++ b/src/baby_monitor/repositories/interfaces/diaper_change_repository_interface.py
@@ -0,0 +1,48 @@
+"""Interface for diaper change repository operations."""
+
+from abc import ABC, abstractmethod
+from datetime import datetime
+
+
+class DiaperChangeRepositoryInterface(ABC):
+    """Interface for diaper change log data access operations."""
+
+    @abstractmethod
+    def create(
+        self,
+        child_id: int,
+        change_time: datetime,
+        poop_amount: str | None = None,
+        poop_color: str | None = None,
+        pee_amount: str | None = None,
+        pee_color: str | None = None,
+    ) -> dict:
+        """Create a new diaper change log entry."""
+
+    @abstractmethod
+    def get_by_id(self, diaper_change_id: int) -> dict | None:
+        """Get a diaper change log by ID."""
+
+    @abstractmethod
+    def get_by_child_id(self, child_id: int) -> list[dict]:
+        """Get all diaper change logs for a specific child."""
+
+    @abstractmethod
+    def get_by_user_id(self, user_id: int) -> list[dict]:
+        """Get all diaper change logs for a specific user's children."""
+
+    @abstractmethod
+    def update(
+        self,
+        diaper_change_id: int,
+        change_time: datetime | None = None,
+        poop_amount: str | None = None,
+        poop_color: str | None = None,
+        pee_amount: str | None = None,
+        pee_color: str | None = None,
+    ) -> dict | None:
+        """Update a diaper change log entry."""
+
+    @abstractmethod
+    def delete(self, diaper_change_id: int) -> bool:
+        """Delete a diaper change log entry."""
diff --git a/src/baby_monitor/routers/diaper_change.py b/src/baby_monitor/routers/diaper_change.py
new file mode 100644
index 0000000..19154b4
--- /dev/null
+++ b/src/baby_monitor/routers/diaper_change.py
@@ -0,0 +1,153 @@
+"""Diaper change log management router."""
+
+from typing import Annotated
+from fastapi import APIRouter, HTTPException, Depends
+
+from baby_monitor.models.diaper_change import (
+    CreateDiaperChangeRequest,
+    UpdateDiaperChangeRequest,
+    DiaperChangeResponse,
+)
+from baby_monitor.routers.auth import verify_token
+from baby_monitor.repositories.diaper_change.sqlite_diaper_change import (
+    SQLiteDiaperChangeRepository,
+)
+from baby_monitor.repositories.dependencies.get_diaper_change_repository import (  # noqa: E501
+    get_diaper_change_repository,
+)
+from baby_monitor.repositories.child.sqlite_child import SQLiteChildRepository
+from baby_monitor.repositories.dependencies.get_child_repository import (
+    get_child_repository,
+)
+
+router = APIRouter(prefix="/api/diaper-changes", tags=["diaper-changes"])
+
+
+@router.post("", response_model=DiaperChangeResponse, status_code=201)
+def create_diaper_change(
+    request: CreateDiaperChangeRequest,
+    user_id: Annotated[int, Depends(verify_token)],
+    diaper_repo: Annotated[
+        SQLiteDiaperChangeRepository, Depends(get_diaper_change_repository)
+    ],
+    child_repo: Annotated[SQLiteChildRepository, Depends(get_child_repository)],
+) -> DiaperChangeResponse:
+    """Create a new diaper change log entry."""
+    # Verify the child belongs to the authenticated user
+    child = child_repo.get_by_id(request.child_id)
+    if not child:
+        raise HTTPException(status_code=404, detail="Child not found")
+
+    if child["user_id"] != user_id:
+        raise HTTPException(status_code=403, detail="Access denied to this child")
+
+    diaper_change = diaper_repo.create(
+        child_id=request.child_id,
+        change_time=request.change_time,
+        poop_amount=request.poop_amount.value if request.poop_amount else None,
+        poop_color=request.poop_color.value if request.poop_color else None,
+        pee_amount=request.pee_amount.value if request.pee_amount else None,
+        pee_color=request.pee_color.value if request.pee_color else None,
+    )
+
+    return DiaperChangeResponse(**diaper_change)
+
+
+@router.get("", response_model=list[DiaperChangeResponse])
+def get_user_diaper_changes(
+    user_id: Annotated[int, Depends(verify_token)],
+    diaper_repo: Annotated[
+        SQLiteDiaperChangeRepository, Depends(get_diaper_change_repository)
+    ],
+) -> list[DiaperChangeResponse]:
+    """Get all diaper change logs for the authenticated user's children."""
+    diaper_changes = diaper_repo.get_by_user_id(user_id)
+    return [DiaperChangeResponse(**dc) for dc in diaper_changes]
+
+
+@router.get("/{diaper_change_id}", response_model=DiaperChangeResponse)
+def get_diaper_change(
+    diaper_change_id: int,
+    user_id: Annotated[int, Depends(verify_token)],
+    diaper_repo: Annotated[
+        SQLiteDiaperChangeRepository, Depends(get_diaper_change_repository)
+    ],
+    child_repo: Annotated[SQLiteChildRepository, Depends(get_child_repository)],
+) -> DiaperChangeResponse:
+    """Get a specific diaper change log by ID."""
+    diaper_change = diaper_repo.get_by_id(diaper_change_id)
+
+    if not diaper_change:
+        raise HTTPException(status_code=404, detail="Diaper change log not found")
+
+    # Verify the diaper change belongs to user's child
+    child = child_repo.get_by_id(diaper_change["child_id"])
+    if not child or child["user_id"] != user_id:
+        raise HTTPException(status_code=403, detail="Access denied")
+
+    return DiaperChangeResponse(**diaper_change)
+
+
+@router.put("/{diaper_change_id}", response_model=DiaperChangeResponse)
+def update_diaper_change(
+    diaper_change_id: int,
+    request: UpdateDiaperChangeRequest,
+    user_id: Annotated[int, Depends(verify_token)],
+    diaper_repo: Annotated[
+        SQLiteDiaperChangeRepository, Depends(get_diaper_change_repository)
+    ],
+    child_repo: Annotated[SQLiteChildRepository, Depends(get_child_repository)],
+) -> DiaperChangeResponse:
+    """Update an existing diaper change log."""
+    diaper_change = diaper_repo.get_by_id(diaper_change_id)
+
+    if not diaper_change:
+        raise HTTPException(status_code=404, detail="Diaper change log not found")
+
+    # Verify the diaper change belongs to user's child
+    child = child_repo.get_by_id(diaper_change["child_id"])
+    if not child or child["user_id"] != user_id:
+        raise HTTPException(status_code=403, detail="Access denied")
+
+    updated = diaper_repo.update(
+        diaper_change_id=diaper_change_id,
+        change_time=request.change_time,
+        poop_amount=request.poop_amount.value if request.poop_amount else None,
+        poop_color=request.poop_color.value if request.poop_color else None,
+        pee_amount=request.pee_amount.value if request.pee_amount else None,
+        pee_color=request.pee_color.value if request.pee_color else None,
+    )
+
+    if not updated:
+        raise HTTPException(
+            status_code=500, detail="Failed to update diaper change log"
+        )
+
+    return DiaperChangeResponse(**updated)
+
+
+@router.delete("/{diaper_change_id}", status_code=204)
+def delete_diaper_change(
+    diaper_change_id: int,
+    user_id: Annotated[int, Depends(verify_token)],
+    diaper_repo: Annotated[
+        SQLiteDiaperChangeRepository, Depends(get_diaper_change_repository)
+    ],
+    child_repo: Annotated[SQLiteChildRepository, Depends(get_child_repository)],
+) -> None:
+    """Delete a diaper change log."""
+    diaper_change = diaper_repo.get_by_id(diaper_change_id)
+
+    if not diaper_change:
+        raise HTTPException(status_code=404, detail="Diaper change log not found")
+
+    # Verify the diaper change belongs to user's child
+    child = child_repo.get_by_id(diaper_change["child_id"])
+    if not child or child["user_id"] != user_id:
+        raise HTTPException(status_code=403, detail="Access denied")
+
+    success = diaper_repo.delete(diaper_change_id)
+    if not success:
+        raise HTTPException(
+            status_code=500, detail="Failed to delete diaper change log"
+        )
diff --git a/src/baby_monitor/static/index.html b/src/baby_monitor/static/index.html
index 00d7fca..29a4433 100644
--- a/src/baby_monitor/static/index.html
+++ b/src/baby_monitor/static/index.html
@@ -431,7 +431,9 @@
             <p><strong>Logged in as:</strong> ${username}</p>
           </div>
           ${feedingButtonHtml}
-          <p>Your session is active.</p>
+          <button class="feeding-button" onclick="window.location.href='/log-diaper.html'" style="background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%); margin-top: 20px;">
+            🧷 Log Diaper Change
+          </button>
         `;
       }
 
diff --git a/src/baby_monitor/static/log-diaper.html b/src/baby_monitor/static/log-diaper.html
new file mode 100644
index 0000000..94f2978
--- /dev/null
+++ b/src/baby_monitor/static/log-diaper.html
@@ -0,0 +1,454 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Log Diaper Change - Baby Monitor</title>
+    <style>
+      * {
+        margin: 0;
+        padding: 0;
+        box-sizing: border-box;
+      }
+
+      body {
+        font-family:
+          -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu,
+          Cantarell, sans-serif;
+        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+        min-height: 100vh;
+        display: flex;
+        justify-content: center;
+        align-items: center;
+        padding: 20px;
+      }
+
+      .container {
+        background: white;
+        border-radius: 12px;
+        box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
+        padding: 40px;
+        max-width: 500px;
+        width: 100%;
+      }
+
+      h1 {
+        color: #333;
+        margin-bottom: 10px;
+        font-size: 28px;
+      }
+
+      .subtitle {
+        color: #666;
+        margin-bottom: 30px;
+        font-size: 14px;
+      }
+
+      .form-group {
+        margin-bottom: 20px;
+      }
+
+      label {
+        display: block;
+        margin-bottom: 8px;
+        color: #333;
+        font-weight: 600;
+        font-size: 14px;
+      }
+
+      input,
+      select {
+        width: 100%;
+        padding: 12px;
+        border: 1px solid #ddd;
+        border-radius: 6px;
+        font-size: 14px;
+        transition: border-color 0.2s;
+      }
+
+      input:focus,
+      select:focus {
+        outline: none;
+        border-color: #667eea;
+      }
+
+      .button {
+        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+        color: white;
+        border: none;
+        padding: 12px 24px;
+        border-radius: 6px;
+        font-size: 16px;
+        font-weight: 600;
+        cursor: pointer;
+        transition:
+          transform 0.2s,
+          box-shadow 0.2s;
+        width: 100%;
+        margin-top: 10px;
+      }
+
+      .button:hover {
+        transform: translateY(-2px);
+        box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
+      }
+
+      .button:active {
+        transform: translateY(0);
+      }
+
+      .button:disabled {
+        opacity: 0.6;
+        cursor: not-allowed;
+        transform: none;
+      }
+
+      .button.secondary {
+        background: #6c757d;
+        margin-top: 10px;
+      }
+
+      .button.secondary:hover {
+        box-shadow: 0 4px 12px rgba(108, 117, 125, 0.4);
+      }
+
+      .message {
+        padding: 12px;
+        border-radius: 6px;
+        margin-bottom: 20px;
+        display: none;
+      }
+
+      .message.show {
+        display: block;
+      }
+
+      .message.error {
+        background: #ffebee;
+        border-left: 4px solid #f44336;
+        color: #c62828;
+      }
+
+      .message.success {
+        background: #e8f5e9;
+        border-left: 4px solid #4caf50;
+        color: #2e7d32;
+      }
+
+      .help-text {
+        font-size: 12px;
+        color: #666;
+        margin-top: 4px;
+      }
+
+      .loading {
+        text-align: center;
+        padding: 20px;
+        color: #666;
+      }
+
+      .section-title {
+        color: #666;
+        font-size: 13px;
+        font-weight: 600;
+        text-transform: uppercase;
+        letter-spacing: 0.5px;
+        margin: 25px 0 15px 0;
+        padding-top: 15px;
+        border-top: 1px solid #eee;
+      }
+
+      .section-title:first-of-type {
+        border-top: none;
+        margin-top: 0;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="container">
+      <h1 id="pageTitle">🧷 Log Diaper Change</h1>
+      <p class="subtitle">Record a diaper change</p>
+
+      <div id="message" class="message"></div>
+
+      <form id="diaperForm">
+        <div class="form-group">
+          <label for="childSelect">Child *</label>
+          <select id="childSelect" required>
+            <option value="">Select a child</option>
+          </select>
+        </div>
+
+        <div class="form-group">
+          <label for="changeTime">Change Time *</label>
+          <input type="datetime-local" id="changeTime" required />
+        </div>
+
+        <div class="section-title">💩 Poop Information (Optional)</div>
+
+        <div class="form-group">
+          <label for="poopAmount">Poop Amount</label>
+          <select id="poopAmount">
+            <option value="">None</option>
+            <option value="light">Light</option>
+            <option value="medium">Medium</option>
+            <option value="heavy">Heavy</option>
+          </select>
+        </div>
+
+        <div class="form-group">
+          <label for="poopColor">Poop Color</label>
+          <select id="poopColor">
+            <option value="">None</option>
+            <option value="black">Black</option>
+            <option value="yellow">Yellow</option>
+            <option value="green">Green</option>
+            <option value="brown">Brown</option>
+          </select>
+        </div>
+
+        <div class="section-title">💧 Pee Information (Optional)</div>
+
+        <div class="form-group">
+          <label for="peeAmount">Pee Amount</label>
+          <select id="peeAmount">
+            <option value="">None</option>
+            <option value="light">Light</option>
+            <option value="medium">Medium</option>
+            <option value="heavy">Heavy</option>
+          </select>
+        </div>
+
+        <div class="form-group">
+          <label for="peeColor">Pee Color</label>
+          <select id="peeColor">
+            <option value="">None</option>
+            <option value="clear">Clear</option>
+            <option value="yellow">Yellow</option>
+            <option value="red">Red</option>
+          </select>
+        </div>
+
+        <button type="submit" class="button" id="submitBtn">
+          Log Diaper Change
+        </button>
+        <button type="button" class="button secondary" onclick="window.location.href='/'">
+          Cancel
+        </button>
+      </form>
+    </div>
+
+    <script>
+      // Check if user is authenticated
+      const token = localStorage.getItem("access_token");
+      if (!token) {
+        window.location.href = "/login.html";
+      }
+
+      // Check if we're in edit mode
+      const urlParams = new URLSearchParams(window.location.search);
+      const diaperChangeId = urlParams.get("id");
+      const isEditMode = !!diaperChangeId;
+
+      // Update UI for edit mode
+      if (isEditMode) {
+        document.getElementById("pageTitle").textContent = "🧷 Edit Diaper Change";
+        document.getElementById("submitBtn").textContent = "Update Diaper Change";
+      }
+
+      let children = [];
+
+      // Load children when page loads
+      async function loadChildren() {
+        try {
+          const response = await fetch("/api/children", {
+            headers: {
+              Authorization: `Bearer ${token}`,
+            },
+          });
+
+          if (response.ok) {
+            children = await response.json();
+            const select = document.getElementById("childSelect");
+
+            children.forEach((child) => {
+              const option = document.createElement("option");
+              option.value = child.id;
+              option.textContent = child.name;
+              select.appendChild(option);
+            });
+
+            // If editing, load the diaper change data
+            if (isEditMode) {
+              await loadDiaperChangeData();
+            } else {
+              // Set default time to now for new entries
+              const now = new Date();
+              now.setMinutes(now.getMinutes() - now.getTimezoneOffset());
+              document.getElementById("changeTime").value = now
+                .toISOString()
+                .slice(0, 16);
+
+              // Load last used child from localStorage
+              const lastDiaperChange = JSON.parse(
+                localStorage.getItem("lastDiaperChange") || "{}"
+              );
+
+              if (lastDiaperChange.child_id) {
+                document.getElementById("childSelect").value =
+                  lastDiaperChange.child_id;
+              }
+            }
+          } else {
+            showMessage("Failed to load children", "error");
+          }
+        } catch (error) {
+          console.error("Error:", error);
+          showMessage("Network error. Please try again.", "error");
+        }
+      }
+
+      // Load diaper change data for editing
+      async function loadDiaperChangeData() {
+        try {
+          const response = await fetch(`/api/diaper-changes/${diaperChangeId}`, {
+            headers: {
+              Authorization: `Bearer ${token}`,
+            },
+          });
+
+          if (response.ok) {
+            const diaperChange = await response.json();
+
+            // Populate form fields
+            document.getElementById("childSelect").value = diaperChange.child_id;
+
+            // Convert UTC time to local datetime-local format
+            const changeTime = new Date(diaperChange.change_time);
+            changeTime.setMinutes(
+              changeTime.getMinutes() - changeTime.getTimezoneOffset()
+            );
+            document.getElementById("changeTime").value = changeTime
+              .toISOString()
+              .slice(0, 16);
+
+            document.getElementById("poopAmount").value =
+              diaperChange.poop_amount || "";
+            document.getElementById("poopColor").value =
+              diaperChange.poop_color || "";
+            document.getElementById("peeAmount").value =
+              diaperChange.pee_amount || "";
+            document.getElementById("peeColor").value =
+              diaperChange.pee_color || "";
+          } else {
+            showMessage("Failed to load diaper change data", "error");
+          }
+        } catch (error) {
+          console.error("Error:", error);
+          showMessage("Network error. Please try again.", "error");
+        }
+      }
+
+      // Handle form submission
+      document
+        .getElementById("diaperForm")
+        .addEventListener("submit", async (e) => {
+          e.preventDefault();
+
+          const childId = parseInt(document.getElementById("childSelect").value);
+          const changeTime = new Date(
+            document.getElementById("changeTime").value
+          ).toISOString();
+          const poopAmount = document.getElementById("poopAmount").value || null;
+          const poopColor = document.getElementById("poopColor").value || null;
+          const peeAmount = document.getElementById("peeAmount").value || null;
+          const peeColor = document.getElementById("peeColor").value || null;
+
+          const submitBtn = document.getElementById("submitBtn");
+          submitBtn.disabled = true;
+          submitBtn.textContent = isEditMode ? "Updating..." : "Logging...";
+
+          try {
+            const url = isEditMode
+              ? `/api/diaper-changes/${diaperChangeId}`
+              : "/api/diaper-changes";
+            const method = isEditMode ? "PUT" : "POST";
+
+            const body = isEditMode
+              ? {
+                  change_time: changeTime,
+                  poop_amount: poopAmount,
+                  poop_color: poopColor,
+                  pee_amount: peeAmount,
+                  pee_color: peeColor,
+                }
+              : {
+                  child_id: childId,
+                  change_time: changeTime,
+                  poop_amount: poopAmount,
+                  poop_color: poopColor,
+                  pee_amount: peeAmount,
+                  pee_color: peeColor,
+                };
+
+            const response = await fetch(url, {
+              method: method,
+              headers: {
+                "Content-Type": "application/json",
+                Authorization: `Bearer ${token}`,
+              },
+              body: JSON.stringify(body),
+            });
+
+            if (response.ok) {
+              // Save last used child for next time (only for new entries, not edits)
+              if (!isEditMode) {
+                localStorage.setItem(
+                  "lastDiaperChange",
+                  JSON.stringify({
+                    child_id: childId,
+                  })
+                );
+              }
+
+              showMessage(
+                isEditMode
+                  ? "Diaper change updated successfully!"
+                  : "Diaper change logged successfully!",
+                "success"
+              );
+              setTimeout(() => {
+                window.location.href = "/";
+              }, 1000);
+            } else {
+              const errorData = await response.json();
+              showMessage(
+                errorData.detail || "Failed to log diaper change",
+                "error"
+              );
+              submitBtn.disabled = false;
+              submitBtn.textContent = isEditMode
+                ? "Update Diaper Change"
+                : "Log Diaper Change";
+            }
+          } catch (error) {
+            console.error("Error:", error);
+            showMessage("Network error. Please try again.", "error");
+            submitBtn.disabled = false;
+            submitBtn.textContent = isEditMode
+              ? "Update Diaper Change"
+              : "Log Diaper Change";
+          }
+        });
+
+      function showMessage(text, type) {
+        const messageDiv = document.getElementById("message");
+        messageDiv.textContent = text;
+        messageDiv.className = `message ${type} show`;
+      }
+
+      // Initialize
+      loadChildren();
+    </script>
+  </body>
+</html>