Really odd experience today in DD's developmental checkup. She has had yearly checks because she was born at 27 weeks and it's 'What they do' in this area. One of the questions I was asked was 'Does DD know she's a little girl?' I looked flummoxed and said I doubted it as I didn't think she really understood the difference between boys and girls - and sure enough, when asked she said she was a boy.
Do your children know if they are boys or girls and do they know the difference? Does it make a difference that she is an only child so far? And does it matter ?! It struck me as an odd question to ask anyway!