Acid reflux in infants is very common. At least half of all infants are born with some degree of reflux simply from immaturity of the the lower esophageal sphincter (LES). The LES is a valve at the bottom of the esophagus which opens to let food and liquids into your stomach and then closes again so it doesn't come back out. Acid reflux happens when this valve does not close properly, causing stomach contents to reflux back into the esophagus.
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