The clinical manifestations of four-month-old babies with cerebral palsy are mainly in four aspects: 1. developmental backwardness, normal four-month-old babies have a stable vertical head and will roll over, but babies with cerebral palsy are more backward in development, such as four-month prone position won’t lift their heads, can’t make them laugh, etc.; 2. babies with cerebral palsy will have abnormal postures, such as head backward, jerking, airplane hand, hand clenched fist tight, thumb inward, pointed foot, scissor step, foot inversion and valgus, knee and hip joint Some babies have unstable muscle tone, with fixed flexion of the upper limbs, head hanging back, frog posture, W posture, etc.; 4, few spontaneous activities of the limbs. In normal babies, there are graceful spontaneous limb activities at that age, such as amplitude and intensity of the movement parts.