My DD is 4 months old and has no teeth. She isn't teething either as far as I can tell but she has started to "bite" or clamp down on my nipple while nursing. It doesn't happen every time and it happens more on one side than the other. It REALLY hurts! My ODD nursed for 28 months and never bit even after she got teeth so this is uncharted territory. Why is she doing this and how can I get her to stop?? Thanks!