 [ Symptoms ] crooked stiff neck and slight neck pain [ Disease ] put him in a jump suit type clothing or bibbed overalls so that he cannot get at his diaper if you notice him doing it make an immediate correction and offer him something more appropriate to eat reminding him that good boys do not eat their diapers it is yucky do not make a big deal about it but in order to change this behavior you have to a catch him in the act and b make an appropriate behavioral correction do not spank him  and c offer him a appropriate snack instead periodically when he is not munching on his diaper give him a big hug and tell him how proud you are that he is not eating his diaper positive reinforcement goes a long long way in changing behavior this nasty habit will not last long