diff --git a/core/forms.py b/core/forms.py
index ae488075..a236d79c 100644
--- a/core/forms.py
+++ b/core/forms.py
@@ -64,6 +64,31 @@ class DiaperChangeForm(forms.ModelForm):
         kwargs = set_default_child(kwargs)
         super(DiaperChangeForm, self).__init__(*args, **kwargs)
 
+    def clean(self):
+        """Additional form validation/cleaning.
+        """
+        errors = {}
+
+        # One or both of Wet and Solid is required.
+        if not self.cleaned_data['wet'] and not self.cleaned_data['solid']:
+            errors['wet'] = forms.ValidationError(
+                'Wet and/or solid is required.',
+                code='missing-wet-or-solid')
+            errors['solid'] = forms.ValidationError(
+                'Wet and/or solid is required.',
+                code='missing-wet-or-solid')
+
+        # Color is required when Solid is selected.
+        if self.cleaned_data['solid'] and not self.cleaned_data['color']:
+            errors['color'] = forms.ValidationError(
+                'Color is required for solid changes.',
+                code='missing-color')
+
+        if len(errors) > 0:
+            raise forms.ValidationError(errors)
+
+        return self.cleaned_data
+
 
 class FeedingForm(forms.ModelForm):
     class Meta:
@@ -86,6 +111,23 @@ class FeedingForm(forms.ModelForm):
         kwargs = set_default_duration(kwargs)
         super(FeedingForm, self).__init__(*args, **kwargs)
 
+    def clean(self):
+        """Additional form validation/cleaning.
+        """
+        errors = {}
+
+        # "Formula" Type may only be associated with "Bottle" Method.
+        if (self.cleaned_data['type'] == 'formula'
+                and self.cleaned_data['method'] != 'bottle'):
+            errors['method'] = forms.ValidationError(
+                'Only "Bottle" method is allowed with type "Formula".',
+                code='bottle-formula-mismatch')
+
+        if len(errors) > 0:
+            raise forms.ValidationError(errors)
+
+        return self.cleaned_data
+
     def save(self, commit=True):
         instance = super(FeedingForm, self).save(commit=False)
         if self.timer_id: