C.B.
i mostly agree with beth, except i would definitely say, "NO BITING" firmly as i removed him from the situation. 10 months is plenty old enough to learn "no" - my son was walking by 9 months and knew that "NO" meant no - there are too many things a walking baby can get into - he's not too young to learn that. don't give him a long drawn out conversation (i.e. attention) over it...just NO. and take him away from whoever he's biting. period. it's not funny and it's not a game, and showing him you're unhappy with him is necessary in this situation.