Because of the damage to brain function, patients with brain injury tend to have emotional or behavioral abnormalities, which are more common in children with the large-footed tachycardia type. In addition, most children with brain injury show excessive activity, distraction and disorganized behavior. Compared to the above-mentioned obvious external manifestations, easy to attract parents’ attention and vigilance of the brain-damaged babies, some other brain-damaged babies because usually do not make a lot of noise is very quiet, parents will be mistaken that the child is very good, will not attract sufficient attention. According to the law of pediatric development, normal babies can mostly reach the standard of “seven sitting and eight crawling”, while infants with brain injury are far from this developmental indicator, which is often clinically manifested as 3 months can not lift their heads, 4 months can not smile, 4 months both hands still clenched fist will not be released, 5 months can not grasp objects, 8 months can not At 5 months, they cannot grasp objects, at 8 months, they cannot sit alone, at 10 months, they cannot crawl, and at 1 year, they cannot walk. In short, the early symptoms of many babies with brain injury are excessive quietness and little active movement. Therefore, if parents find their babies too quiet do not take it lightly, must seize the time to go to the hospital for examination, in order to achieve early diagnosis and treatment, for the child’s recovery to buy valuable time.