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Causes
By Mayo Clinic staff
Normally, the ring of muscle between the esophagus and the stomach (lower esophageal sphincter) relaxes and opens only when you swallow. Otherwise, it's tightly closed — keeping stomach contents where they belong. Until this muscle matures, stomach contents may occasionally flow up the esophagus and out of your baby's mouth. Sometimes air bubbles in the esophagus may push liquid out of your baby's mouth. In other cases, your baby may simply drink too much, too fast.
