Infants spitting up milk from the nose and mouth may be related to improper feeding methods, digestive tract malformations, encephalitis and other causes. 1. Improper breastfeeding: If breastfeeding is too rapid and too fast, resulting in the milk in the baby’s mouth not being able to enter the stomach in time, spitting up from the nose and mouth may occur. 2. Malformations of the digestive tract: If there is congenital pyloric obstruction, the infant ingests milk causing high pressure at the lower end of the stomach, which may result in milk spitting out of the nose and mouth. 3. Encephalitis: If an infant suffers from encephalitis, projectile vomiting may occur, causing milk to be spit out of the nose and mouth. Parents are advised to take their children to the hospital in time to clarify the cause, and if treatment is needed, it should be standardized under the guidance of the doctor.