Babies spitting up water with a little milk residue is usually not normal and is considered to be caused by indigestion. After a baby drinks milk, the milk will enter the stomach and resolve a mixture of whey and stomach acid. Since the baby’s stomach is horizontal and the stomach muscles are not well developed, resulting in a relaxed cardia, spitting up may occur if too much breastfeeding is done or if air is swallowed. When the milk is digested in the stomach, the unabsorbed whey is spit out along with the gastric juices, and the baby will have spit up clear water with some milk residue. As the newborn’s gastrointestinal function is weak, too full and too frequent feeding will lead to indigestion. Parents should adjust the baby’s eating habits, breastfeeding should be regular, quantitative, and according to the baby’s growth and development of the time period of reasonable planning for the amount of each feeding. At the same time, after each feeding can be vertical pick up the baby, gently pat the baby’s back, so that the gas into the stomach out of the body. If the baby often appears to spit up water with a little milk residue, parents should take the baby to the hospital for treatment.