Why do infants spit up?

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Dr. Mehmet Oz, MD
Cardiology (Cardiovascular Disease)
As food slides down, it moves into the esophagus pretty smoothly, then reaches the gastroesophageal junction, which joins the bottom of the esophagus to the top of the stomach. This is where a muscle contracts and prevents stomach acid from spilling up into the throat and causing heartburn. In infants, this muscle is often very lax, which is why they're prone to developing reflux, where food squirts back up from the stomach into the esophagus, causing spit-up or vomit.
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YOU: Raising Your Child: The Owner's Manual from First Breath to First Grade

There’s little doubt that parenting can be one of the most rewarding and satisfying experiences you’ll ever have. But it can be plenty tough, too: Around the clock, you’re working to keep your...

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.