I feel your pain. My 4.5 month old enjoys graping and squeezing my boob skin. My DH asked me what all those marks are the other day.
I tell her, in mommy's firm voice, No and usually she unlatches and gives me a -what? Me?- look and goes back to nursing. I have been slipping my finger in her hand which sometimes satisfies her.
ISO EUC wool covers and longies