Fair enough...

People generally don't have babies for sake of the babies. They have them because they WANT the baby.

I think that most people have kids partially because of a biological imperative and partially becaue they, emotionally, want a pert of themselves for the future. Thee are other reasons, of course, but I think that those are the main two.

If people had babies for sake of the person that the baby would be, then they would have as many children as possible.

Understand that I am not evaluating the word 'selfish' as a negative thing. I an evaluating is as 'done for self' without other connotation. People have kids because they WANT kids.