Whether or not a three-month-old baby is okay after falling on the back of the head is related to the strength of the injury and whether or not it is combined with an intracranial injury. If a three-month-old baby falls on the back of the head, the affected area is only mild pain, the child shows a short period of crying and the subsequent activities are no different from the usual, no other manifestations, it is considered unlikely that intracranial injuries, usually without treatment can subside on their own. However, if the baby fell to the back of the head after the injury, lethargy, vomiting, reduced physical activity, depression, or even blurred consciousness, we should be alert to the possibility of combined intracranial injury, should be sent to the regular hospital as soon as possible, for examination and treatment. In conclusion, if a three-month-old baby falls on the back of the head, if the baby is mildly injured and there is no subsequent discomfort, it is usually not a big problem; if combined with intracranial injury, it is usually more serious. Prompt medical attention is recommended.