A child who falls on his or her head more severely may vomit, usually within twenty-four to forty-eight hours; however, if the child’s fall is not severe, he or she may not vomit. The details vary from person to person. Most children will vomit within 24 hours of the fall if the injury is severe, and a few may delay it until 48 hours. However, not every child who falls on his or her head will vomit. If the fall is not severe, vomiting may not occur. If parents find that their child has poor mental health, lethargy, vomiting, headache, crying and restlessness after a fall on the head, they need to be alert to intracranial injuries such as concussion and brain hemorrhage, and need to take their child to the hospital for examination in a timely manner. After the child fell on the head, parents need to timely soothe, and then continuously observe whether the vomiting, and timely medical treatment, so as not to delay the child’s condition.