Vomiting in newborn babies may be related to improper feeding, or it may be caused by infectious diseases and intestinal diseases. 1. Improper feeding: For example, the bottle nipple used for the newborn is too big, the nipple of the mother is inverted, which causes the child to swallow more air when he/she eats the milk, or the proportion of formula milk is not proper, frequent feeding, etc., all of which may cause the newborn to vomit. 2. Infectious diseases: such as neonatal pneumonia, neonatal sepsis, etc., due to inflammation and infection, may cause gastrointestinal symptoms, resulting in neonatal vomiting, may also be accompanied by fever, cough and other symptoms. 3. Intestinal diseases: such as congenital digestive tract developmental abnormalities, intestinal torsion, intestinal obstruction, etc., may cause neonatal vomiting, which may also be accompanied by abdominal pain, abdominal distension and other symptoms. Vomiting in newborns may also be caused by other reasons. If the symptoms are frequent and recurring, or there are other obvious discomfort, it is recommended to consult a doctor as soon as possible, and after a clear diagnosis of the causative factors, give targeted treatment.