This is to avoid that Chinese parents abort in order to have a male child. (Even though nowadays many Chinese parents want girls).
Still there is a Chinese belief that is supposed to help determine the sex of the child:
- When the pregnant woman belly has a angular triangle shape and the belly falls down very low, then it means that the child will be a girl!
- When the pregrant woman belly has a round shape, then it means that the child will be a boy!