My nephew is very small and 16mo old. He was 4.9lbs at birth, had pyloric stenosis. He doesn't eat very much and seems to burp a lot. He seems bloated. He has had problems with constipation and for a while was vomiting. He will still sometimes burp up juice. At his 12mo check he had not gained any weight from his last check up . He is suppose to be on prevacid, I bought it because his mother said he didn't need it because he was not vomiting anymore. Worried Aunt.