my baby is preemie born at 31 weeks, he is totally on formula, having lot of gss an colic pain. he even denies to take milk when awake. all the time cranky, with lots of Discomfort, giving him colicaid and digestive enzymes, switched to nan excella pro, but no sign of relief. doctor suggested for similac total comfort.. some of my friends suggested for lactogen as it's basic milk and one of my friend used nan low lac. please suggest which one should I switch to nan low lac, similac total comfort or lactogen? please help 🙏