Link from other interesting factors
MacCulloch & Waddington (1981) and Ellis & Ames (1987):
- maternal immunization against male fetal tissues or products, specifically testosterone brought about by previous pregnancies with males. This might reduce the mother’s ability to carry the male fetus to term or androgen’s activity, which would decrease the ability to masculine the fetal brain fully. (McAnulty & Diamant, 1995)