The symptoms of baby brain atrophy include the following: First, the child shows no interest in the surroundings, poor responsiveness, significantly reduced movements, poor sucking ability, and often chokes on milk. Second, the child with brain atrophy exhibits abnormal muscle tone and posture. Symptoms of cerebellar atrophy include difficulty in abducting the thighs, difficulty in extending the knees, legs straightened and adducted when held upright, legs crossed in a scissor-like manner, bent elbow and wrist joints, and the hands often clenched with the thumb turned inward. Third, congenital reflexes are weakened or may not appear at all, such as the rooting reflex, grasp reflex, and embrace reflex, which are either weakened or completely absent. Fourth, there is limited voluntary movement; the baby cannot reach out voluntarily to grab liked objects after five months or always uses one hand to reach for things. Fifth, there are signs of intellectual disability, delayed language development, or language disorders.