There are two main causes of spitting up in newborns, as described below. First, it is caused by gastroesophageal reflux. Due to the child’s relatively young age, the gastroesophageal development is not too perfect, for example, the child’s pylorus tension is relatively large, while the cardia tension is relatively loose, and the esophagus tension is relatively low, thus the child will have physiological gastroesophageal reflux. If the child does not burp in time and the parents do not pat the back, the child is more likely to develop GERD. After the child has GERD, he or she will experience symptoms such as spitting up and gagging. Secondly, it is caused by neonatal pneumonia. If the child suffers from neonatal pneumonia, in addition to spitting, often accompanied by nodding breathing, breathing rate significantly faster, which are caused by the child’s lung gas and gastric qi upward reversal, this time to give the child timely treatment of neonatal pneumonia.