Cerebral palsy is mainly ruled out in one-and-a-half year old babies through medical history, clinical manifestations, and imaging tests. 1. Medical history: Exclude any abnormal medical history during pregnancy, perinatal period and neonatal period, such as ischemic-hypoxic encephalopathy, kernicterus, trauma, hypoglycemia and other conditions that may cause cerebral palsy. 2. Clinical manifestations: Examination to rule out whether the baby has backward motor development, limb movement disorder, abnormal muscle tone, abnormal limb posture, abnormal tendon reflexes and other clinical manifestations of cerebral palsy. 3. Imaging: Cranial magnetic resonance imaging (MRI) to rule out brain damage, such as softening of the white matter around the ventricles of the brain, can assist in the diagnosis. To rule out cerebral palsy in your child, try to go to the pediatric care department of the hospital and let a professional doctor check it out.