For infants, spitting up is a normal part of life. Many babies spit up a lot. Most likely this happens because of the way a baby develops.
The muscle that closes the feeding tube from the baby’s mouth to his stomach is still developing in infants. It may be weak. As a result, even a tiny burp can cause small amounts of stomach contents to come back up.
If your baby is usually happy and gaining weight, you should not be concerned about his spitting up.
You should see your doctor if your baby:
Nearly half of all healthy infants under one year of age spit up two or more
times a day.
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