I am breast feeding and supplementing with formula. At the hospital they used enfamil so that's the kind I bought when we were home. When I give him a breast milk bottle he is happy and content but if I have to give him formula (while we are out of if he is still hungry) he gets all squirmy like it upsets his tummy. One time he had a mucusy poop and he had had two formula bottles two feeding in a row. I read that could mean an allergy. I'm looking to switch formulas what would you lovely ladies suggest?