If your baby still eats his thumbs frequently after 5-6 months of age, be aware of the possibility of cerebral palsy. Most of them are caused by the rotation of both upper limbs forward and the increased muscle strength of palmar flexors, and are prone to symptoms such as the inability to center both upper limbs, poor awareness of active grasping of objects with both hands, and airplane hands. Attention should be paid to intelligence assessment and determination of muscle strength and tone, combined with the presence of high-risk factors such as prematurity, low birth weight, and hypoxic-ischemic encephalopathy before, during, or after birth of the baby. If there are any of these manifestations and medical history, promptly go to the hospital for examination and, if necessary, cranial MRI, genetic metabolic disease, chromosomal disease and other related tests. If the baby only occasionally has the phenomenon of thumb eating is normal.