Has anyone else noticed that all the gender dissapointment is with boys?

DogCat&Baby

MotherMonster:

I got what I wanted, but mine was medical related as to why I didn't want a boy. We feel however we feel and honestly this is an old song and dance. Who cares? To each their own. Dwelling on it, in my opinion, is stupid and a waste of time! I know I have better things to do.

What would be medically related to having a boy vs girl? Sorry if this is a niave question.