Newborns spitting out milk residue may be caused by improper feeding, indigestion, acute gastroenteritis and other reasons. 1. Improper feeding: If a newborn is usually overfed after birth, and if you don’t pay attention to the feeding posture during the feeding process, and if you swallow a lot of air in the stomach, the symptom of a newborn spitting up milk residue may occur. 2. indigestion: due to the age of the newborn is relatively small, digestion and absorption ability is not too perfect, if the one-time consumption of too much may increase the burden on the intestinal tract, prone to newborns spit out milk residue of the situation. 3. Acute gastroenteritis: clinically, acute gastroenteritis, due to gastric dysfunction, may lead to digestion and absorption is affected, the newborn spit out the symptoms of milk residue. In normal life to the newborn baby breastfeeding to master the correct breastfeeding posture, less food, more meals. If the newborn spits up milk seriously or accompanied by other uncomfortable symptoms, parents should take the newborn to the hospital in time to improve the examination to clarify the cause of the disease, to give targeted treatment or treatment.