If the baby is exceptionally mobile, it is an abnormal condition. If the baby is within 3 months of age, has excessive involuntary movement of the limbs, and is accompanied by abnormal crying, not easy to be soothed, easy to tilt the head back, difficulty in breastfeeding, easy to make a fist with both hands, and body thrashing, etc., and there are high-risk factors before, during, or after birth, such as preterm birth, low birth weight, hypoxic-ischemic encephalopathy, and multiple births, etc., and if there are any of these manifestations and history, we should pay attention to the existence of the possibility of brain injury syndrome, and we should consult a pediatric If the child is over 5 years old, it is better to consult a pediatric rehabilitation department. If the child is over 5 years old, is active and interferes with the normal order of others at school or other occasions, it is possible that the child has hyperactivity disorder, and should go to the hospital in a timely manner.