I breastfed my baby, and if I drank milk, my baby would spit up. When I stopped ingesting milk and other dairy products, my baby didn’t spit up at all. Since such a large percent of people are lactose intolerant, so this made sense to me and it was a simple fix (though going dairy free for that long was tough!).
Colloquially, most parents and pediatricians make a distinction between “spit up” and “vomit.” Spit up happens when an immature esophagus can’t keep its little trap door closed and it just oops back out. You’ll see videos of babies sitting very peacefully and milk just dribbles back out— there’s no diaphragm action that forces it the stomach to empty entirely. Vomit, on the other hand, is forceful and reactive, usually in response to illness.
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