I missed some of this as have had a huge stomach upset - lots of faeces coming out of my anus to use the correct terminology.
I think people have misinterpreted my post - I didn't mean that all these things were hidden from me until I was 12 or that they should be. My family were quite open and used to walk around naked a lot, talk about bums, willies, bosoms (just not vaginas).
When I was young none of the girls in my class started their periods until they were 12 or 13, by which time, one way or another, we all knew what was going on!
Obviously I don't want to "hide" these things from my dd & I agree that particularly as girls are having puberty younger these days they need to know earlier than I did.
I was mainly responding to the original poster who said her dd was age 2. My dd is also 2 and as she doesn't even know when she's doing a wee yet I don't think she needs to know anything more about her anatomy than the fact that she's got a bottom.
Given her hit and miss grasp of language at the moment if I told her she had a vagina she'd probably call it a donkey the next time I asked & even then I doubt that she know what it was short of me actually poking it for her.
I agree with the poster who said that that certainly up to age 5 kids are more concerned about the urinary uses of their penises etc.
I think that the exact anatomical details of reproduction can be saved at least until this age and probably older.