Babies tend to sleep a little more than before in the fall and winter because they are less active, but they are in good spirits, which is physiological and does not require special treatment. If the child is obviously drowsy during the fever, when the temperature rises, the nervous system is suppressed and the child appears to be in a bad state of mind and drowsy, but the fever subsides immediately, this situation also does not require special treatment. If the child’s temperature is normal but he or she is still drowsy, it is possible that the child has encephalitis or other serious infectious diseases, so the child needs to be tested for routine blood tests, cerebral fluid, and if necessary, cranial magnetic resonance and electroencephalography to help make a diagnosis. If the child has drowsiness, poor mental status, nausea, vomiting, irritability and pallor in case of head trauma, it is considered to be caused by intracranial hemorrhage or concussion and needs to be treated promptly. There are many causes of drowsiness, most of which are due to neurological disorders, so it is important to actively identify the cause and treat it symptomatically.