Symptoms of hypoxia in infants due to prolonged labor include disturbances of consciousness, changes in muscle tone, abnormal primitive reflexes, increased intracranial pressure, brainstem symptoms, and convulsions. 1. Disorders of consciousness: mainly manifested as different degrees of inhibition or excitement, with over-excitement manifested as irritability, over-reaction to stimuli, trembling and shaking of jaws and limbs, prolonged eye-opening time, and staring, etc.; and inhibition manifested as lethargy, unresponsiveness, and even coma. Mild hypoxia mainly manifests excitement, moderate manifestation is lethargy, and severe manifestation is coma, which often deteriorates rapidly. 2. Changes in muscle tone: muscle tone is increased, weakened or even flaccid. Mild hypoxia limb muscle tone is normal or increased, can be manifested as limb hyperflexion, increased resistance to limb movement, moderate and severe children show muscle tone is weak or disappear. 3. Abnormal primitive reflexes: in mild hypoxia, the embracing and sucking reflexes are excessively active; in moderate and severe cases, they are weakened or disappeared. 4. Increased intracranial pressure: it usually becomes obvious 4~12 hours after birth, with bulging fontanel, increased tension and separation of cranial sutures due to cerebral edema. 5. Brainstem symptoms: some infants with severe hypoxia have irregular respiratory rhythm, apnea, pupil narrowing or dilation, and slow or absent reaction to light. 6. Convulsions: mild seizure type or multifocal clonic type is common. Mild seizure type can be manifested as apnea, eyeball deviation, eyelid twitching, mouth and lip trembling, sucking and swallowing movements, pupil dilation, etc., and the severe ones can be manifested as tonic or myoclonic convulsions. Infants with these symptoms should go to the hospital in time and receive standardized treatment under the guidance of a doctor.