Jet spitting after drinking milk is often due to physiological factors such as excessive inhalation of gas, as well as certain pathological factors such as pyloric stenosis and central nervous system disorders. 1. excessive gas inhalation: babies spitting up after drinking milk may be caused by inhaling a large amount of gas during the process of drinking milk in the wrong position or drinking too fast. 2. Pyloric stenosis: Pyloric stenosis may also cause babies to spit up after drinking milk, usually around 10-30 minutes after drinking milk. 3. central nervous system diseases: encephalitis, myelitis, intracranial hemorrhage and other central nervous system diseases may also lead to the baby after drinking milk jet spit up. The baby after drinking milk jet spit up, there may be other reasons, it is recommended to go to the hospital in time to improve the examination to determine the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.