This case is recently popular. Themed : Gender reveal cake . It is normally purchased by going to born father to mum where the sex gender is 1st informed or reveal to mother to be 

The cake on the outside is pink and blue ( can be either a boy or a girl ) 

however when cut 

if the cream inside is pink ( it is a GIRL !) 

if the cream inside is Blue ( it is a BOY !) 

for this design it is a simple round cake as seen the order person will decide the inside color upon order , we will custom the cake for you