My five-month-old vomits after every feed. Is it normal?

About half of all babies during their first few months experience their stomach contents coming back up into the esophagus, a condition known as gastroesophageal reflux, infant reflux or infant acid reflux. Normally, a muscle (lower esophageal sphincter) between the esophagus and the stomach keeps stomach contents where they belong. Until this muscle has time to mature, spitting up might be an issue — especially if your baby is relatively full. Spitting up is the easy flow of a baby's stomach contents through his or her mouth, possibly with a burp. Vomiting occurs when the flow is forceful — shooting out inches rather than dribbling from the mouth. So if your baby is vomiting after every feed, and it's not just 'spit up', it might be better to see your doctor.