Pediatric vomiting is divided into three degrees: small amount of vomiting: infants spit out a little curd when belching after eating milk is a normal phenomenon, do not worry. Moderate vomiting: small vomit several times a day, the baby may have congenital short esophagus, esophageal hiatal hernia, or esophageal flaccid inability. Massive vomiting: vomiting most or all of the milk consumed with great force. It may be due to pyloric stenosis (the most common cause), a urinary tract infection or other more serious illness, or other rarer abnormalities. You can start by assessing the extent of your baby’s vomiting.