The parent didn't imply "maternal instinct". That's one explanation for the gap in knowledge. The other is socialization. It's no secret that girls play "house"

The parent didn't imply "maternal instinct". That's one explanation for the gap in knowledge. The other is socialization. It's no secret that girls play "house" more, play with dolls, are taught by traditionally maternal role models, are more likely to take babysitting classes, etc. More women than men plan a large part of their life around being a parent.