HyperKiasu:i didn't believe a kid may be under stress until i read your post. ya, my DS eats a lot and eat fast, his stomach might be under stress.my DH eats less and slower, she almost never complains stomachache.My pd told me that he has come across cases whereby whenever the kids need to do something they don't like or fear, they start to have tummyache... This is a kind of stress.