Ten days old baby spit up, considered by the physiological and anatomical characteristics of the stomach, may also be eating too fast, too fast caused by the following: 1, physiological and anatomical characteristics of the baby’s stomach was horizontal, the entrance cardia and the exit of the stomach pylorus is almost at the same level, the cardia sphincter is not well developed, relatively loose, and the pyloric sphincter development is relatively good, relatively tight. When a child eats too much milk, the milk in the stomach will overflow from the relaxation of the cardia, which will lead to spitting phenomenon. 2, eat milk too quickly, too fast: also with the swallowing action to swallow some air in the stomach, when the milk, if parents did not burp in time, the air in the stomach upward process of the milk will be with the air through the relaxation of the cardia to the esophagus, which leads to the baby spitting up. Parents are advised to hold their babies upright and burp them after they finish eating, which can reduce the occurrence of spitting up.