My 3 year old DS has never been particularly oral. I was always grateful that he doesn't gnaw or suck on his toys, sticks, hands, etc. Suddenly for several weeks his hands are ALWAYS in his mouth. Any moment that his hands are idle he will be sucking on a finger (not thumb) or just holding them there. He doesn't seem to notice that he does it. All his teeth are in I think so I'm clueless as to what this is due. Two months ago we had quite a few changes - baby brother born plus a move from toddler group to preschool group in daycare. He seems to be handling all the changes well - so I wouldn't guess this is stress related. Any ideas why this is happening and ANY suggestions how to stop it???