Runs and stomach cramps were what my son would get everytime he would have normal milk, he'd be in alot of discomfort. He'd naturally not feel like much milk either, never asked for it even before I realised the two were linked. Perhaps start with A2 milk (from the supermarket, fresh) and see how your tum goes with that? Elijah tolerates it fine. Then if you still have probs, then try ricemilk, so much yummier than soy And there is lots of bad news with processed soy and soy formula.