There are many reasons why newborns spit up all the time, including physiological and pathological factors, of which physiological factors are mainly caused by immaturity of the child’s development and improper feeding posture, while pathological factors are mainly caused by neonatal pneumonia and pyloric stenosis. 1. Physiological factors: the development of the gastrointestinal system of newborns is not mature enough, the stomach is still presented as a horizontal position, easy to stomach capacity is relatively small, coupled with the development of newborns cardia is not yet perfect, so it is more likely to spit up the phenomenon, with the growth of the age of the development of maturity can be relieved. In addition, when feeding newborns, the posture is not right, or feeding too fast, etc., can also lead to the emergence of spitting up. 2. Neonatal pneumonia: some newborns have pneumonia, often with atypical symptoms, often manifested as spitting up, choking, spitting bubbles, shortness of breath and other manifestations, the need for timely medical treatment, the serious need for ventilator-assisted ventilation. 3. Pyloric stenosis: some babies have congenital pyloric hypertrophy, which can lead to the occurrence of pyloric stenosis, obstacles to the passage of food and gastric juices, which causes vomiting, abdominal pain and loss of appetite, and so cause spitting up. Vomiting tends to be more frequent in this case, and the diagnosis can be assisted by a complete abdominal ultrasound and other relevant tests. In addition, esophageal atresia and acute gastroenteritis can cause newborns to spit up all the time, so it is best to go to the hospital and find out the cause of the disease.