I. Causes and manifestations of abnormal hand posture Children with spastic cerebral palsy have abnormal postures of internal rotation and back extension of the upper limbs, wrist flexion, finger clenching and thumb inversion during movement due to the tension of the upper limb flexors, which hinders the development of their hand functions and prevents them from completing normal life self-care, such as feeding and grasping; at the same time, the development of posture and mobility is affected due to the impairment of the establishment of upper limb balance. It is necessary to interrupt this abnormal pattern, improve the functional state of upper limbs, improve self-care ability and promote the development of movement. Method 1: Parents can hold the baby’s elbow joint with one hand and the palm of the baby’s hand with the other hand, with the baby’s thumb placed between the parent’s index finger and middle finger, so that the baby’s upper limb is kept in a fully extended position. Method 2: The parents can first gently massage the baby’s masseter muscle and push the thumb outward, then separate the baby’s remaining four fingers and thumb.