I don't have real numbers, but it also seems like the very rich also have quite a few children. Super rich financial people in NYC have loads of kids, almost like a hobby. I've met super rich guys here who have 8 kids with 3 different wives. It seems to have a lot to do with whether or not your kids are going to effect you negatively economically. Super rich? Who cares... Super poor? who cares. Middle class or even sort of rich? Kids are going to make your life a financial headache.