Seven-month-old babies spit up, may be imperfect development, improper feeding and other physiological factors, but also may be acute gastroenteritis, intussusception, as well as mesenteric lymphadenitis and other causes. 1. Physiological factors: seven-month-old babies may spit up due to the imperfect development of the vomiting center, poor coordination of the swallowing muscle group, small gastric capacity, pancreatic sphincter relaxation. In addition, feeding the baby too fast, feeding the amount of milk, feeding the baby swallowed a lot of air, can also lead to the baby spit up. These are normal physiological phenomena and do not require treatment. 2. Acute gastroenteritis: Acute gastroenteritis may be caused by viral infections, bacterial infections, medication factors and other reasons. Patients will have nausea and vomiting, diarrhea, abdominal pain and other manifestations. If the seven-month-old baby has acute gastroenteritis, it will be manifested as spitting up. 3. Intussusception: Intussusception is considered to be caused by infection, abnormal intestinal peristaltic rhythm and other factors. Patients will have paroxysmal abdominal pain, blood in the stool, abdominal mass, abdominal distension, vomiting and other symptoms. If the seven-month-old baby suffers from intestinal obstruction, there may be spitting up. 4. Other: seven-month-old babies with spitting up are also considered to be caused by mesenteric lymphadenitis, meningitis and so on. Seven months of the baby spit up, 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.