Quote Originally Posted by Whoever View Post

The fetal reproductive organs don't even start to develop until the end of the third month. It is virtually impossible to note them in an ultrasound at this point. As pinot_noir said, gender details are not notable before 20 weeks (5 months) into the pregnancy, far too along for the abortion.

Whoever

This assumes the parents are using an ultra sound to determine the sex. Amniocentesis can also be used, and amnio's are usually done at 16 weeks.