When it comes to the question "Mommy/Daddy/, where do babies come from?" You can go many ways with this. You could tell them than a Stork delivers them to mommies and daddies. You could tell them that a magical fairy creats a baby for the couple. Or you could try to explain to you son/daughter how people create children, in words that they will understand. With any of theses suggestions, it's all about details. You know your kids better than anyone. You know or have a pretty good idea what they can and can't handle. With any of the suggestions I named, be sure to try to answer any questions they may have and make sure the understand what you're trying to tell them.  In my case, I kind of figured it out on my own through television and stories I heard. If you think your child is smart enough to figure taht out, then let them. However, be prepared to answer a TON of questions. No one said being a parent was going to be easy. Whey they learn, you learn.