my daughter also has inverted nipples, which make the 'boobies' she has look a lot more obvious. Hmm, I wonder if it is more that just a collection of puppy fat. I don't intend to take her to a doctor or anything right now because I figure all that will do is give her a complex about her body, which is the last thing a healthy 4yo needs. But I might keep a very close eye on her incase she develops any other symptoms of far too early puberty.

ETA just saw the last two responses and feel a lot better now! I think she might develop early like I did, but I'll put it down to a fatty collection just now. Phew Thanks everyone