Tucker is turning 6 months next Tuesday and lately he has been biting pretty hard. The only time he is biting hard is when we try to get something out of his mouth. Today he was sneaky and managed to get a whole pack of gum and he would not let me take it out, and when I went to get it he bit my hand really hard almost puncturing it. Is this a stage or is there something I could do to prevent him from biting so hard esp. when I am trying to get something out of his mouth?