C.W.
We told him God put the baby there :)
I told one of mine it takes a mommy and a daddy and then God makes the baby. I have also told them the baby lives in the womb or uterus and it is like a big balloon filled with water. That is cool, lol!
When it is time for baby to come out, I said mom's have a special hole for babyes to come out. If asked if it hurts, I said, yes but it is worth it, because "you" are so precious to me.
I don't belive in giving kids more information the needed, let's let our kids be kids. Just answer what you have to, as little as possible and in in doubt ask him what he thinks. That can be great fun!