I think we may have a thumb/finger sucker here. He refuses to take a pacifier (we have tried EVERY brand/type made) and I've caught him rooting for his hands a few times. So far he hasn't succeeded in getting his thumb in his mouth. As a longtime former thumb-sucker I'm really hoping to discourage this. I'd much rather wean him from a pacifier or just go without a soother than struggle to get him to stop sucking his thumb down the line. I think I finally stopped at the embarrassingly late age of 10 or 11 only after my parents bribed me with getting my ears pierced if I stopped.