Scissor gait of the lower limbs is a clinical manifestation of spastic bilateral lower limb paralysis in cerebral palsy. The scissor gait is due to the increased muscle tone of both lower limbs, especially the increased tension in the extensor muscles, and the lower limbs are over-extended when moving, and the legs are crossed in a scissor shape. How to diagnose cerebral palsy? 1. Ask if there is any history of upper motor neuron dysplasia or damage, such as premature birth, difficult birth, high fever, cerebral ischemia, cerebral hypoxia, cranial injury, cerebral infection, etc. 2. Check for spastic paralysis, muscle movement disorder, muscle tone enhancement, hyperreflexia, muscle atrophy, joint deformity, ataxia and mental retardation. Children diagnosed with cerebral palsy based on clinical manifestations must also undergo the following auxiliary examinations: intelligence test, electroencephalography, brainstem auditory evoked potential measurement. The diagnosis of cerebral palsy is confirmed by imaging tests. The manifestations of cerebral palsy vary depending on the etiology and typology, but are more common in the early stages: (Early symptoms in the first half of the infant with cerebral palsy (within 6 months)) 1. Body tenderness and reduced spontaneous movements, which are symptoms of hypotonia, can be seen at one month. If it persists for more than 4 months, it can be diagnosed as severe brain injury, mental retardation or muscular system disorders. 2. Stiffness of the body, which is a symptom of hypertonia, can be seen at one month. If it persists for more than 4 months, it can be diagnosed as cerebral palsy. 3. Slow reaction and unresponsiveness to name calling, which is an early manifestation of mental retardation. It is generally considered that slow reaction at 4 months of age and unresponsiveness to name calling at 6 months of age can be diagnosed as mental retardation. 4. Abnormal head circumference. Head circumference is an objective indicator of the morphological development of the brain, and children with brain injury often have abnormal head circumference.