Women who waited to find out sex. Research suggests not only do women's attitude change towards the fetus, but they treat the child in the womb differently according to sex. The pregnant woman felt able to be a nurturer to the girl inside. Boys were treated and talked to as being more independent.
Theories suggest it is an invasion of a female body by the male.
The social dynamic of gender roles begins earlier than birth. This means women begin to socialize a child in the womb. I knew a woman who found out she was going to have a little girl. She bought clothes and named the child. She induced birth 3 weeks late to find she was a mother of a little boy.