How To Make A Duckie Onesie Cake

Every cake decorator needs a go to gender neutral baby shower cake that fits the bill for any occasion. Cute, modern and easy, this Duckie Onesie Cake is the perfect project to make that happen. It starts with a fool proof onesie shaped cake pan and fondant pressed into a chocolate mold which makes for an instant duckie applique, no sculpting or carving required. Finish with a little piping and dots and you have yourself a standard in your repetoire you can make over and over again.

RECIPE NOTES: Our onesie pan requires one box mix cake, or if you want to go from scratch we recommend our Vanilla Cake Recipe. You'll also need a good homemade buttercream for this project. Make our Brenda's Bakery Buttercream recipe for an icing that's tastes great and works well for smoothing.

Availability: In stock

Shop ProductsPriceQty
Baby Onesie Shaped Cake Pan
Fat Daddio's Yellow Rolled Fondant Icing - 8oz
Small Rubber Ducky Chocolate Mold
# 48 Flat Tip
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Availability: In stock



Grease and flour the cake pan and bake according to the box directions or our Vanilla Cake Recipe. Once cool, wrap the cake in plastic wrap and place in the freezer for 1/2 hour or so for the cake to firm up before icing it.

Prepare 1 1/2 batch of Brenda's Bakery Buttercream and tint two cups light yellow for piping.


Remove the cake from the freezer and ice a thin crumb coat to seal in any crumbs. Next, ice the cake in a normal layer of buttercream, maintaining the shape of the onesie as best possible. Let the cake sit out for 1/2- 1 hour until the surface gets slightly crispy before starting the paper towel technique.

Crumb coating a onesie cake

Icing a onesie cake

How To Ice A Onesie Cake

Next, use a paper towel (the side with no pattern) to smooth the cake by gently laying it on the surface of the cake and rubbing it with your hand. This should smooth out the spatula marks and will leave a very slight texture from the towel which looks like fabric.

Once smooth, use a toothpick to trace where yellow piping should go. Use your pan as a guide.

Smoothing a cake with paper towel

How To Ice A Onesie Cake

Pipe the trim in yellow using a comb tip. We used a #48 comb/flat piping tip.

How To Pipe A Onesie Cake


Knead 2 oz. of fondant with your hands until smooth and wrinkle free. Push the blob of fondant into the duckie mold cavity and then flatten the back of it with your fingers. The back of the fondant will extend beyond the edge of the mold.

Remove the duck by gently tugging at the edges of the excess fondant until it comes out. Then, use an x-acto knife or pairing knife to cut around the duck to remove the excess fondant.

Thin some orange and blue food coloring with a little water or alcohol and add some color to the duck's beak, cheeks and eyes. Test your color on some extra fondant before painting your duck. Place the duck on the cake using a little dab of buttercream to adhere.

How To Make A Fondant Duckie


Roll some yellow fondant 1/4 - 1/8" thick. Use a piping tip to cut out polka dots. Pop the fondant out of the tip by poking through the tip with a toothpick. Use a tiny bit of buttercream to adhere the dots. Voila! You're done!

How To Make A Duckie Onesie Cake

How To Make A Duckie Onesie Cake | Cakegirls Step x Step