There are many reasons for babies to spit up, the common ones are imperfect development of the digestive tract, small stomach capacity, pathological factors and so on. 1. Imperfect development of the digestive tract: As babies are relatively young, the development of the digestive tract is still imperfect, which can easily lead to spitting up. 2. Small stomach capacity: Babies’ stomach capacity is small and horizontal, when babies eat too much milk and inhale too much gas, it will easily cause spitting up. 3. Pathological factors: when babies suffer from gastroenteritis, respiratory infections, intussusception, intestinal obstruction, congenital megacolon and other diseases, due to the stimulation of germs, abnormalities in the baby’s body structure and other factors, it is easy to lead to the baby spitting up. There are many other reasons for babies to spit up, you need to go to the hospital in time to do the relevant examination, to clarify the cause of the disease, and then actively carry out the treatment. At the same time, you need to pay attention to the correct and scientific feeding of infants.