7-month-old baby suddenly vomits milk for the following reasons: 1, gastrointestinal cold, resulting in gas, indigestion, causing sudden vomiting, hot compresses or clockwise massage of the abdomen can relieve; 2, intestinal infection, viruses or bacteria can lead to intestinal infection, causing sudden vomiting, often accompanied by diarrhea, abdominal pain, fever and other symptoms, should be examined at the hospital, under the guidance of the doctor to give anti-infection and rehydration treatment; 3, intussusception, the baby suddenly vomits milk, accompanied by paroxysmal crying, abdominal distension, should be immediately given air enema treatment to relieve; 4, intracranial infection, the baby suddenly vomits milk. 3, intussusception, the baby suddenly vomit milk, accompanied by paroxysmal crying, abdominal distension, should immediately go to the hospital to perform abdominal ultrasound examination, after confirming the diagnosis of air enema treatment can be relieved; 4, intracranial infection, the baby vomiting large mouth for the jet, accompanied by fever, poor mental status, to pay attention to intracranial infection, should immediately go to the regular hospital examination to clarify the diagnosis. In short, the baby has serious vomiting, do not blindly use antiemetic drugs, should go to the hospital for examination, so as not to delay the condition.