Why Is My Baby Vomiting After Breastfeeding?

Why Is My Baby Vomiting After Breastfeeding? Vomiting. Spitting up and dribbling milk with burps or after feedings is fairly common in newborns. This is because the sphincter muscle between the stomach and the esophagus (the tube from the mouth to stomach) is not as strong as it will eventually become as the baby matures.