My one son was a terrible biter at about that age. I was thinking of quiting the gym it was so bad he was biting all the babies. I could see all the moms were not so happy with me. So I talked to the owner and he said the same thing happened with their kid and he told me to by a clip like you would use to keep a pacifer attatched to his shirt with and put a jelly like teething ring on it. Then encourage him when he felt like biting to chomp down on it. It worked like a charm. No more biting incidents, no more mad moms. What a relief!