I just did a cake like this a couple of weeks ago. It was very easy. For this type of cake,you will have to do the belly in fondant. You won't be able to see the footprint with buttercream. For the footprint, I simply molded a small footprint out of gum paste and let it dry overnight. The next day I positioned the footprint where I wanted it, glued it down with a dab of buttercream, draped my fondant, smoothed as needed then took a small fondant tool and gently pressed into the fondant on the foot to make the indentations between the toes. My cake served about 75 and I used the soccer ball pan and the two baseball pans for the tummy and boobs. I placed these on top of a sheet cake. You could use the baseball pan for the belly and cupcakes for boobs on top of a 1/4 sheet cake to make your servings.The mother to be loves owls so I also molded a small owl and chain to hang around the neck. Hope this helps.