J.M.
My one year old started as soon as his teeth came in and really hasnt stopped but he has a binkie that helps. If you dont want to use a bink try a blanket that is small enough that he can cary around. A news letter that I get via email says that it can be because of many different things but that usualy its because they are new things to play with and raking ::shudder:: them back and forth is his way of trying them out. Also it could be some mild stress releiver for him. The news letter said not to worry and that they usualy grow out of it. The letter also suggested that you give him plenty of things to bang on as a stress reliever (toy drum, pots and pans, tupper wear) what ever you can come up with. Some times this helps. Good luck.