The common causes of jet spitting in seven-month-old babies include physiologic spitting, gastrointestinal disorders, and brain disorders. 1. Physiological spitting up: Low-month-old babies are prone to milk overflow and spitting up due to their small stomach capacity and horizontal position, but it does not affect the baby’s milk volume, spirit, growth and development. 2. Gastrointestinal diseases: Acute gastroenteritis, pyloric stenosis, intestinal obstruction, etc. may cause babies to spit up in jets, accompanied by diarrhea, abdominal distension, fever, stop defecation and other symptoms. 3. Brain diseases: intracranial infections, tumors, etc. may cause projectile vomiting, accompanied by fever, dysphoria, lethargy and other manifestations. Seven-month-old baby projectile vomiting, there may be other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.