Hello, My 4 month old daughter was originally on NAN milk and she had very loose poops, often with mucus to this frequent gases. After consulting a pediatrician, we started using Nutramigen milk. Initially, everything was ok poop identical to the description, dense green. After less than a month I noticed again poops that mucus. Again I went to the pediatrician, who informed me that perhaps Nutramigen is too sharp and prescribed us Bebilon pepti syneo. We are at the stage of changing the melczek.. at the moment we are still serving them with Nutramigen. The daughter started often and a lot of downpours to this you can hear the deer overflowing in her tummy and crying terribly. Should you urgently go to the pediatrician again or wait another month for a possible effect? Can changing milk affect tummy pain in a baby? The baby started much less during the day,and evening feeding before bedtime is a real struggle and crying.