I have a 16 month old baby. For the last 4 days, he seems to have stomach aches/pains. A few times an hour, he will suddenly start crying, stamp his feet very hard and hold on to me very tight (that it actually hurts me). It is not a tantrum. And after a few minutes, he stops as if it didn t happen. Is this stomach pain, teething or something else?? His back teeth are coming through.