Why my baby spits up?
Spitting up is common in healthy babies. About half of all babies experience gastroesophageal reflux, also called infant reflux, during their first three months. Normally, a valve (lower esophageal sphincter) between the esophagus and the stomach keeps stomach contents where they belong. Until this valve has time to mature, spitting up might be an issue — especially if your baby eats too much. When babies are eating they take in air getting trapped in their stomach causing gas and spit up.