Infant brain injury needs to be diagnosed based on clinical symptoms, birth history, and combined with auxiliary examinations. The main diagnostic methods are as follows: 1. Birth history: history of prematurity, intrauterine distress and birth asphyxia, severe jaundice, hypoglycemia, shock and other high-risk medical history; 2. Symptoms: agitation, refusal to eat, poor sucking, abnormal muscle tone, drowsiness, coma, convulsions and other symptoms; 3. Other examinations: cranial ultrasound, CT, MRI, evoked potentials, video EEG and other brain electrophysiological examinations.