Elegant half-moon shaped celebration cake with pastel pink buttercream frosting, white rosettes, fresh raspberries, and a gold "6 months" topper on a matte white ceramic stand, captured in soft natural light with a blurred dessert table background.

HALF BIRTHDAY CAKE: CELEBRATING 6 MONTHS OF SWEETNESS

Quick Facts:

🕒 Prep Time: 30 minutes

🍳 Cook Time: 25-30 minutes

🎂 Total Time: 1.5-2.5 hours

👥 Servings: 8-10

🌟 Difficulty: Easy-Moderate

💰 Cost: $8-$18

What is a Half Birthday Cake?

A half birthday cake is a delightful semicircle celebration cake designed specifically for marking a baby’s incredible 6-month milestone. Perfect for capturing adorable smash cake photos and commemorating half a year of growth!

Dietary Tags:

✅ Vegetarian

🌱 Vegan Option Available

🌾 Gluten-Free Adaptable

Essential Equipment:
  • 8-inch round cake pan
  • Hand mixer or whisk
  • Mixing bowls
  • Serrated knife
  • Offset spatula
  • Cooling rack

Pro Tip: No specialized equipment? No problem! A chef’s knife and standard baking tools work perfectly.

A bright kitchen countertop with organized baking ingredients in glass bowls, sunlight streaming through a window, a stand mixer, measuring spoons, and a digital scale.

Ingredients:

Cake Batter:

  • 180g all-purpose flour
  • 150g granulated sugar
  • 1.5 tsp baking powder
  • 1/4 tsp fine salt
  • 2 large eggs
  • 180ml milk
  • 80ml neutral oil
  • 2 tsp vanilla extract

Buttercream Frosting:

  • 170g unsalted butter
  • 300-360g powdered sugar
  • Pinch of salt
  • 1 tsp vanilla extract
  • 1-3 tbsp milk/cream
Step-by-Step Method:

1. Prepare Your Workspace

  • Preheat oven to 350°F/175°C
  • Grease and line 8-inch pan
  • Bring eggs and milk to room temperature

2. Make the Cake Batter

  • Whisk dry ingredients in one bowl
  • Combine wet ingredients separately
  • Gently mix wet into dry until just smooth
  • Pour into prepared pan

3. Bake and Cool

  • Bake 25-30 minutes
  • Check doneness: Skewer comes out clean
  • Cool in pan 10 minutes
  • Transfer to rack, cool completely

4. Shape and Assemble

  • Level cake top
  • Cut round exactly in half
  • Create half-moon shape
  • Apply thin buttercream layer
  • Optional: Add fruit jam filling

5. Frost and Decorate

  • Apply crumb coat
  • Chill 15-20 minutes
  • Final buttercream layer
  • Decorate with sprinkles/berries

A elegantly styled half-moon cake with pastel buttercream frosting, decorated with piped rosettes, fresh berries, metallic sprinkles, and a '6 months' topper, displayed on a white ceramic stand, captured from a 45-degree angle in a softly lit setting with a blurred background.

Crucial Tips:
  • Don’t overmix batter
  • Ensure cake is completely cool before frosting
  • Chill between coating layers
  • Use room temperature ingredients
Storage:
  • Room temperature (covered): 1 day
  • Refrigerated: 3 days
  • Freeze unfrosted layers: Up to 2 months
Baby-Friendly Variations:
  • Vegan version: Plant milk, egg replacer
  • Gluten-free: 1:1 GF flour blend
  • No-sugar smash cake: Banana-oat base
Common Mistakes to Avoid:
  • Cutting warm cake
  • Skipping crumb coat
  • Overfilling layers
  • Inconsistent mixing
Design Inspiration:
  • Teddy bear theme
  • Rainbow/unicorn
  • “Halfway to One” topper
  • Pastel color palette
Final Notes:

Always consult pediatrician about introducing new foods to infants. For babies under 12 months, minimize sugar and avoid honey.

Celebrate this magical half-year milestone with a cake that’s as special as your little one’s journey!

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