This is not as daring as is sounds!
This is the new trend to come across the Atlantic.
The cake plays a key role at the baby shower. It is cut in front of the guests and the colour of the cake inside reveals the gender of the baby that the couple are expecting. Even the parents are in the dark until the cake is sliced. This is how it works:
The expectant mother attends the hospital for her scans and asks the gender of the baby to be written down and then sealed in an envelope. The mother then passes this to the cake maker without looking and the cake maker designs a baby shower cake. She will colour the sponge either blue or pink. Therefore the gender of the baby is secret from all at the baby shower including the parents until it is served!