My DS 4.5 is really into human anatomy and physiology right now and I keep running into the reproduction discussion in the books that he's getting from the library. (most are around the 3rd grade level, I think)
At this stage, he knows the various organs and parts but not the how. Nor is he asking the how . . .
Basic question: Do I just spill the beans on the details (even though he is very young) or should I keep tiptoeing around it?
I certainly don't want him discussing it with other kids. He already freely uses the word "uterus" in public which freaks people out!

Plus I don't want to take away what little bit of innocence he has either.
What did you do??