Alright looked through the board but there isnt much info.  I looked at this beautiful cake and the person uses regular round pans carves the cake to make the shape.

http://cdn001.cakecentral.com/7/7c/900x900px-LL-7cb3a6d4_gallery7234021333565761.jpeg

My question is how many servings should the following cake yield after slightly carving?

Belly: 

9 inch cake which is 2inch high

8 inch cake which is 2inch high

=4" high

Boobs: Each has 2 6" cakes

=4" high  x2

AI've done a couple of baby bumps and I can say I never had a problem using the biggest cake used as a guideline. So, a 9" cake is 22 servings. But my cake boobs were always less high than the belly. Looks more natural I find. F.e. a 4" high belly would get 2,5-3" high boobs.

I made this one and I used a 10" x3"high pan and 2 8" x3" high pans and for the boobs I bought the sports ball pan that bakes in 2 half spheres. I used the extra shavings to fill gaps between belly and boobs. I did cover fondant in 2 halfs. Did the belly first then boobs and covered seam with the ribbon.   The lady needed to serve about 35 and she said there was maybe 5 pieces left. ( i do not know how big or small the pieces were)

Thanks for the reply...so I finally made the cake with the Ikea 8" and 5" bowls.  I used a double WASC recipe and used all the batter for the belly and the boobs with an 8" cake which is approx 1" high which I didnt use for the cake. So question is approx how much serving would the cake provide?  My first time making the cake and dont feel like I should ask the client how many servings they get after the party.  I quoted her for 20 servings and know it provides more, but need it so I can price is out more accurately for next time. 

You did a fantastic job!! I love the teal color!!

Would you mind sharing what you did charge? I have someone looking for the exact same thing for about 20 people as well. 

I believe this was $85. :)