Ok I need help I'm starting to switch my son to formula because I'm not producing enough milk but I still do give him breast milk when I can get enough out anyways I gave him enfmil and he drank it but it messed up his tummy did the pain cry for hour at a night couldn't poop for 5-6 days so I switched him to gerber good start and he fights to take it but he poops every other day and barley crys so how can I get him to drink it better