A child landing on the back of the head may cause damage to the skull and vomiting may not occur, or it may occur within 3 days and require close observation for 3 days, but the exact duration of vomiting is related to different degrees of cranial injury. If the fall is not particularly severe and the child’s head only has a mild scalp hematoma, vomiting may not occur. If the craniocerebral injury is more serious, resulting in intracranial hemorrhage, may soon appear corresponding manifestations, such as vomiting, depression, or even coma, the symptoms will grow with time, the amount of bleeding will be more and more, if not treated in a timely manner, the amount of bleeding continues to increase, may cause increased intracranial pressure, triggering nausea, vomiting and other discomforts, and if it is more serious, it may also cause coma. After a child hits the back of the head, there may be a risk of delayed cerebral hemorrhage, and the clinic generally recommends close observation for three days. Therefore, even if the child does not show any physical discomfort, parents should try to take the child to the hospital for a brain examination to find out whether the child has suffered a head injury.