Try some 100% PURE canned pumpkin, or 3 cc pepto bismol, or rice . He could have ate to much that it upset his digestion, could he have gotten into anything that would upset his stomach? He could have just been to full and ate to much. Does he eat to fast? Oh, Make sure that it is pure pumpkin, not pie filling. I saw that on one of the forums this morning, You may want to check out " Still Positive for Giardia" That may help. I hope he gets to feeling better.