question: I was giving my grand son a drink out of a plastic punch cup and he bit it I heard it crack and looked and a small piece 1/4 in triangle piece was missing I swept his mouth and didnot feel it and he did not act like he swallowed anything but I could not find the piece. It was two hours before he went to bed and showed no sign of not feeling good now the morew I think about it the more I worry what should I watch for?