I would get some toys on a stick (like a fishing rod) play with him with it as often as you can. When a kitten leaves its mum and brothers and sisters to soon they dont learn the art of playing nicely when he bites and scratches, go away from him and dont give him any kind of reaction. I have a rule in my house and no one is aloud to play with my kittens or cats with their hands, hands are for stroking and grooming, toys are for playing, hope this helps
