Our little guy would play rough too, then we adopted our little girl. They would spend so much time running, playing and grooming each other. Does your baby have a playmate. It is something worth considering since he is so young. Also, if you spend alot of time away from home (working FT etc.) you may consider getting him a companion so that he isn't as lonely. You are doing he best thing by ignoring him.....he's just young and being playful. Try to spend time each day playing with him (with wand toys, mice etc....and then giving him treats as rewards.)