It is very common for babies to vomit after eating milk, but jet vomiting is mostly caused by illness and requires timely examination at the hospital. 1. Jet vomiting in babies may be related to increased intracranial pressure, which leads to increased intracranial pressure: causes include inflammation, cranial trauma, etc. Especially important for newborns, within a week after delivery. Visit a regular hospital as soon as possible to rule out the possibility of intracranial trauma. Central nervous system diseases such as encephalitis, meningitis or tumors can also cause vomiting, characterized by the absence of nausea and jet before vomiting, but often accompanied by other symptoms of the nervous system, such as headache, mental confusion, drowsiness, and even convulsions and coma, etc. Further examination at the hospital is needed to confirm the diagnosis. 2, pediatric congenital gastrointestinal abnormalities: such as gastric torsion, hypertrophic pyloric obstruction, pyloric stenosis, etc. can cause babies to spit up milk. 3, gastrointestinal disorders: often have irregular diet, excessive activity after eating or mental stimulation, etc. Try not to let the child run and jump excessively or criticize the child after drinking milk. If you find that your child suddenly spits up milk, it is best to go to the hospital in time to have a checkup, and then go home to slowly adjust the condition if there is no abnormality.