hi,my baby is of 1n half month old,he don't sleep at night, full night he is awake, because of that,he feed full night, he do extra feeding also,because of that he vomit out,if I dont feed him extra, he cries a lot,n because of that I have to give him feeding, y he is vomiting so much?,n y baby nt sleeping in night?he sleep in day time,at that time he don't take extra feeding, then to he vomit, so I have to ask u ,what is the reason of baby doing vomiting?