I may be wrong, but doesn't teething occur before they get teeth, like a human baby? I think the chewing is just a puppy thing, does your baby have enough toys? My baby was with my sister for two months before I got him when he was four months, and he loved to chew on everything, but, when we got him home he quit. Now he only chews on his toys. My suggestion, get a variety of chew toys and try to keep stuff he might like off the floor. That is all I can suggest. I hope I was able to help, if not, hopefully someone will have some words of wisdom for you.