My 9 mth old has developed this habit of pinching my arm and my breast while she feeds. She rarely does it at any other time. Ive tried moving her hand away numerous times and she either goes straight back to doing it or she will unlatch and arch her back and get cranky at me. Im not sure what to do. It used to be only on occassion . .or not very hard. .but its getting beyond that now .. I have little bruises on my arm from her very tiny pinching fingers. What can I do? Is it like a comfort thing while she feeds? Or is this some other sort of behavious??