I was having this discussion the other day with a few people. My DD (now 9) has always known. What I mean is I have always told her the absolute truth (in age appropriate language and terms) how babies are made. So she's grown up knowing.

Recently I was very shocked to learn a good friend of mine had not told her daughter (10yo) about how babies were made. She said her DD had absolutely no idea that reproduction involved both a man and a woman. Personally, IMO, I think that is just wrong!

I dont see the point of "saving up" the discussion until they are a certain age. I would rather demistify it and treat it like the natural thing it is. I feel the same way about calling genitalia by its correct names too. After all, we dont use euphemisms with our children for our ears or ankles, why should we for vaginas or penises???

Anyway, just my two cents...