There are just cultural changes. When I was young it was expected that if you could have kids then you would. You needed them especially as you got old. Today this is not a view shared by all, more and more people are making their own decisions about having kids.

In my family it seems that each generation is having less and less kids. My great grandparents had a 7-10, my grandparents had 5, my parents had 2, I had 1.

I think the world has enough people, so for me one kid was plenty.