If a child vomits many times in the middle of the night, it is mainly considered to be caused by the following reasons: 1, caused by indigestion in children. If a child eats too much milk or supplemental food, it will exceed the digestive load capacity, causing indigestion, the child will vomit in the middle of the night, and there will also be abdominal distension, abdominal pain, and even in the stool there is undigested food or milk petals, and other symptoms. 2, due to the child suffering from acute gastritis caused by the symptoms. Children eating unhygienic food can cause acute gastritis, which can also cause vomiting in the middle of the night many times.3. If children suffer from acute encephalitis, which causes increased intracranial pressure, it can also lead to vomiting in the middle of the night many times, and have a headache, fever and other symptoms.