my baby is 12 weeks early. he is 4 months uncorrected. he used to take 120 mls easily , but reduced to 100 mls coz of reflux(he is on gaviscon),thought i am pushing him lot. but now he takes 60mls easily and after that he is fussy, pushes the bottle. if i push him he gags and throws all out with force.he doesn't look hungry even in 4 hrs gap. Burping doen't even help.I m worried about his milk intake. what could be the reason? any suggestion?