Frequent spitting up in newborns may be caused by physiological reasons, improper feeding methods, digestive system diseases and other factors. 1. Physiological reasons: newborns have a small stomach capacity, the cardia is not well developed, the stomach is horizontal, frequent spitting up may occur after breastfeeding. At the same time, when the swallowing function of newborns is not perfect, frequent spitting up may also occur. 2. Improper feeding: If parents do not feed properly, such as nursing too many times, feeding too much, too fast, etc., may cause the newborn intake of too much milk or too much air, spitting up frequently. 3. Digestive system diseases: when the newborn occurs congenital esophageal stenosis, congenital hypertrophic pyloric obstruction and other diseases, is also prone to frequent spitting up, and accompanied by growth retardation, refusal to eat and other symptoms. Newborns spit up frequently to rule out physiological causes, parents should take their newborns to the hospital in a timely manner, clear the cause of the disease, and then follow the doctor’s instructions for treatment.