When an eleven-month-old falls out of bed and vomits four days later, the first thing to consider is acute gastroenteritis. It may also be due to delayed intracranial hemorrhage. 1. acute gastroenteritis: whether it is accompanied by diarrhea and bloating, which may lead to vomiting due to acute gastroenteritis. 2. Delayed hemorrhage, such as caused by epidural hemorrhage and intracranial hemorrhage. (1) Epidural hematoma: It is the accumulation of blood between the epidural and the inner plate of the skull. A smaller hematoma may appear at the time of injury, and after four days, the hematoma gradually increases in size. At this time, it is easy to cause intracranial hypertension, which is manifested as nausea and vomiting symptoms. (2) Intracranial hemorrhage: If the head is seriously injured due to trauma, it may lead to intracranial hemorrhage. At the time of injury, the hemorrhage area is small and there is no clinical reaction, but with the increase of hemorrhage range, the intracranial pressure rises. But as the bleeding increases, the intracranial pressure rises, causing vomiting and dizziness. Eleven-month-old baby fell off the bed, vomiting four days later, there may also be other reasons, such as improper feeding, etc., it is recommended to go to the hospital in time, complete the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.