diarrhea, fatty diarrhea (tan, floating, rotten eggs smelling), constipation, even alternating between constipation and diarrhea, large bulky stools;
early satiety, bloating,
early fullness, child choosing to eat foods different from in past, headaches, upset stomach, skin break outs, might be mistaken for hives, sores on tongue, heartburn kind of pain, AND careful tracking of height and weight, those compared to that of siblings if there are any.