I have seen on a youtube video that the female body produces antigenes and antibodies when she is pregnant with a boy. But this behaviour is not produced when she is pregnant with a girl. These means that the more antigenes she produces, the more femminin the next child will be. More antigenes are produced when she is pregnant with a boy.
Is this correct? if yes, then why does the female body produce antibodies and antigenes when the fetus is a boy and not a girl?
What other pregnancy actions or behaviours are gender based?