Quote:
|
Originally Posted by MikeWaters
what about older sisters? (i.e. is it just a function of maternal age/paternal age, instead of being related to having older brothers)..
|
Good question. No, older sisters do not make a difference. Only older brothers. The theory is that it has something to do with with the immune system. A male fetus in a female body is viewed as a foreign tissue by the immune system and the mother's body reacts to it differently.