My baby is birth as a premature child and now he is one n half month old From the starting we had given him similac neo sure milk because his weight is less than 2.5 kg and now his milk has been changed from similac neo sure to similac advance When he is hungry we gave him similac advance and he is doing pooping after drinking a milk not everytime n his potty is yellow in color n he is farting so much n his potty like a patli potty not exactly loosemotion Plz help is there any sign of threat or I have to go to his paediatric Plz give me a solution