When my friend was pregnant with her second baby, her first child - a boy, was 4. When I visited once, and she had a big belly already, I said: so, you're going to buy a babygirl (it's a funny way people say it here in front of very small kids). My godchild, the boy, looked at me and very seriously said: Nana Viorica, you're so big and you don't where the kids come from?
We all laughed, because I remembered that he was very well informed about how and why people have children. I think it is very right to tell kids about their bodies and later about contraception and sex and everything related to it. So many people try it too soon because they don't have any idea of what it is.