There are several aspects to determine drowsiness in infants after a fall: 1. poor mental response, drowsiness, weak crying voice, poor response to touch. 2. indifference to call, indifferent attitude, abnormal speech and behavior. 3. lack of appetite, poor appetite and jet vomiting. 4. there is another situation that should be paid special attention to, at first the patient is in the waking period, in the middle there is a In this case, the patient should also go to the hospital promptly. All of these cases indicate that the child may have a mild concussion or intracranial hemorrhage, which requires urgent diagnosis and timely treatment.