Why do babies often spill some milk from their mouths and sometimes spit up a lot of milk? Small baby milk, is the milk from the mouth after feeding overflow, the amount is not much, a small number of infants in the breastfeeding a few moments due to change diapers and other changes in position caused by milk, such as the baby’s general condition is good, does not affect the growth and development, with the growth of the age of the milk to reduce the overflow to the birth of the natural disappearance of the 6-month phenomenon, is a normal phenomenon. Vomiting and milk is different, the milk is mostly gushing out of the mouth rapidly. It is also a common phenomenon in small babies, and is related to the anatomical and physiological characteristics of the digestive tract of small babies. Small infants’ stomach capacity is small, the location is relatively horizontal, the upper mouth that is the cardia sphincter development is relatively poor, the lower mouth that is the pylorus leads to the intestine, its sphincter development is better. Therefore, the outlet of the newborn’s stomach is tight while the entrance is loose, and the milk is easily refluxed causing vomiting. As the baby grows and develops, it gradually disappears after 6 months. Normal small infants can vomit if they are not fed or cared for properly. Common causes such as too many feedings, too much milk, or the nipple’s aperture is too large, too fast out of the milk, etc.; or feeding the bottle in the milk is not completely filled with nipple, at the same time when eating the milk into the air; or too many changes in the position after feeding, etc.. Vomiting can be prevented by improving feeding and nursing practices, as well as by picking up the baby and patting him on the back to burp him after feeding, and by placing the baby on his right side. If vomiting becomes severe, go to the hospital for examination and prompt treatment.