The stomach of newborns and small infants is generally horizontal, with the growth of age and gravity, the position of the stomach is gradually changing to the adult type, so in the process of growth and development if the improper position, the child makes a strong, etc. can lead to milk spillage, this is called milk spillage is not called vomiting. But infants and children suddenly appear frequent vomiting, there may be several reasons: 1, indigestion: not jet-like vomiting, vomit for old milk, milk lumps or stomach contents, most may also be accompanied by diarrhea or constipation performance; 2, gastrointestinal dysfunction or gastric pyloric spastic obstruction: every milk vomit, and jet-like vomiting, consider the existence of gastrointestinal dysfunction or gastric pyloric spastic obstruction; 3. Intestinal infection: vomiting with emission should be considered intestinal infection; 4. Intracranial infection: jet vomiting accompanied by fever, pay attention to whether there is a combination of intracranial infection, such as viral meningitis, septic meningitis, etc., to be judged comprehensively; 5. Other diseases: in addition to considering indigestion and infection, other diseases should be considered, such as children with pneumonia or pharyngitis, because violent coughing can also lead to vomiting. Therefore, the causes of vomiting should be judged comprehensively. If the child suddenly appears to vomit, it is recommended that the family should bring the baby to the hospital for consultation so that the doctor can solve these problems.