Infants who fall on their heads need to be alert to the appearance of cranial injury, and close observation for 1-3 days is generally recommended. The manifestations of cranio-cerebral injury include local hematoma, cranial fracture, intracranial hemorrhage, etc. Infants can have different manifestations such as abnormal crying, headache, nausea, vomiting or drowsiness and coma. Generally within 24 hours of falling on the head is the most dangerous, the probability of bleeding is greater, you need to go to the hospital to improve the relevant examination, such as head CT or MRI, to determine the cranial injury. In addition, some infants may have delayed cerebral hemorrhage, so the observation time should be extended appropriately, about 3 days, need to go to the hospital to review and closely observe the general condition of the infant. If an infant has a scalp hematoma after a fall on the head, the natural absorption period should be controlled within 3 weeks. If the hematoma is not absorbed after more than 3 weeks, it is necessary to actively puncture and extract the accumulated blood to prevent mechanization of the hematoma; if mechanization has formed and obviously affects the skull shape, early surgery is recommended.