I have a 6 week old baby boy, hes not biologically mine but fighting for custody of him. hes my sisters son and ive had him since day 1. Im curious about his formula, he was a premie born 10 weeks early and has been on Enfamill (Blue Label) "Enfacare for babies born premature" He eats at least 4 ozs to get full off of but after hes done eating he fusses around like hes got an upset stomach or has a hard time pooping? Is it the formula thats causing it or does anybody have any information to help me with this situation?