I've noticed a slight smell of BO on my (just) 7 year old DD. She doesn't seem aware of it and it is usually after exercise/PE. None of my friends have girls this age and I don't know if it is normal or I need to get her checked at the GP. She has had a bit of facial hair on her upper lip since she was about 3 but this is a family trait! She doesn't seem to have any other signs of puberty.