Infants with cerebral palsy are usually detected at the latest between 3 and 6 months of age, as this is the period when delays in motor development can be observed, such as the inability to smile, roll over, grasp and hold things, and so on. If symptoms of cerebral palsy are more pronounced and appear earlier, such as abnormal muscle tone and spasticity in the newborn period, the infant will be recognized promptly after birth. If the cerebral palsy symptoms are not obvious, and the infant develops motor delays, such as not smiling, not stretching fingers, lifting the head weakly, and making fists for a long time at around 3 months of age, and still not rolling over, reaching, or grasping things at around 6 months of age, it will take 3 to 6 months for the infant to be detected. Infants with symptoms such as abnormal muscle tone and delayed motor development are advised to go to the hospital for examination to avoid delay.