My 6 month old puppy has always played bite with me and my son. However, never to leave marks or break the skin.
I think your baby has gone to far, and needs to learn not to. It is inportant that the both of you use the same method of teaching. LIke A child learns which parent to manipulate and how much they can get away with. A puppy will pick it up too.
So Mom has to do the same with the pup more firmly and consistent. When he does not bite, then praise him and give him a small treat. Put him down on the floor, turn your back away from him and he learn game is over when I bite. Your going to both need to do it , and all the time.
