M.M.
Hi there, I have a son 7 now and he did the same thing. When he was 4-6 he chewed his clothes and we would replace them b/c they looked so bad. I told him he wasn't getting any new clothes b/c he didn't take care of the ones he had. I told him he would just have to wear them! With in a month he stopped chewing. He hasn't done it since. I don't know why he did it, maybe nervous or excited no answer....good luck