Newborn Throws Up After Breastfeeding. Even if minimal amount of air is swallowed by your newborn, correct burping techniques can be used to help remove such pockets of air. Although seldom seen in breastfed babies, regular projectile vomiting in a newborn can be a sign of pyloric stenosis, a stomach problem requiring surgery.

(*fingers crossed*) so, your newborn may have vomited because she was not burped after the feeding. During your baby’s first few months, vomiting is probably caused by mild feeding problems, such as his stomach being too full. If the milk has had time to mix with stomach acids, it typically has white chunks and a curdled appearance, similar to the sour milk you get by adding vinegar to milk.