Summary: •Newborns may vomit due to spitting up after eating or GERD, both of which are common and nothing to worry about. • If your baby has other symptoms like a fever or excessive diarrhea, it may have an infection or be dehydrated, and you should call your pediatrician immediately. Why Do Newborns Throw Up? For new parents, nothing is more upsetting than seeing their baby vomit. What's even worse is not knowing why it's happening. Is your baby sick? Are they not eating enough? Is something wrong? Thankfully, in most cases, vomiting is perfectly normal for newborns. Here's everything you need to know about why newborns throw up and when you should be concerned. Reasons Why Newborns Vomit There are a few different reasons why your newborn might vomit. The most common—and harmless—reason is called "spitting up." This happens when your baby's stomach is complete, and they Burp up small amounts of breast milk or formula. Spitting up is perfectly normal, and usu...