well, not all my dc. my dd was able to hold a conversationat 18 months, with proper grammar and all, but couldn't for the love of god get the hang of using the toilet until she was 3.6 at the day, and another year after that to get rid of nappies at night. They just all develop differently, don't they?
But when I expected dc2 she was asking all sorts of questions and I always answered, I was reading her age appropriate books to prepare her for the arrival of her sibling etc.
When I expected dc3, I had to talk to dc2 about the imminent arrival as I was heavily pregnant and he didn't even seem to notice . When I said to him that there's a baby in mummy's tummy and he's going to come and live with us (he was just over 2) he kind of nodded and decided to give his cuddly toy to the new baby (so sweet) and didn't even ask anything. So I left it at that, he was obviousl not ready/ didn't care.
But the child the OP refers to DID ask, I gather.
I don't discuss things openly, I feel out the level of the child's understanding and discuss things accordingly. And lilyjen , noone is to tell you you haven't done the right thing by your daughter, but as you admit, HAD she asked, you would have explained.
Pigletmania, I'm sure your dd will have a lot of questions once your belly starts growing, it probably hasn't crossed her mind it could happen, but when it'll be an everyday reality chances are she'll wonder what's going on (unless she's anything like my dc2)
Oh, and by the way, I have explained to my children that they might hear by other children or adults "different" names that people might use to describe vaginas and penises and gave a few examples, but they wanted to know WHY people use different words and WHY only for those body parts and not, for instance, for our knees or elbows.
THEN I was lost for words.