The most common causes of vomiting in infants and neonates include the following: Acute viral gastroenteritis Gastroesophageal reflux disease Other important causes in infants and neonates include the following: Pyloric stenosis Intestinal obstruction (eg, meconium ileus, volvulus, intestinal atresia, stenosis) Intussusception (typically in infants aged 3 to 36 months) Less common causes of recurrent vomiting include sepsis and food intolerance.