How do you know if your baby is gassy from formula or colic? Today my baby's peds, changed his formula to nutragimen (fingers crossed), my baby is very fussy when he can't poop or burp once he does both he's great. My question is what's the difference? I was also told at a month old max is 3ounces every 3hours but what do you do if your baby is still hungry after the 3ounces is finished? My son is tiny but sometimes I feel after his bottle of 3ounces he's still hungry but I never give more then 3ounces, so I, hoping the nutragimen will fill him more and help his fussiness and crying?