A baby’s legs being tense and the whole body being made up may be normal, or it may be due to epilepsy or cerebral palsy. 1. Normal phenomenon: the baby’s legs are tense, the whole body is a normal reaction, may be due to the presence of metabolic waste in the intestinal tract, intestinal peristalsis is poor, not able to discharge stool in a timely manner due to. If there is no abnormality in the baby’s daily feeding and development, there is no need for special treatment, and exercise can be carried out to improve the above situation. 2. Epilepsy: If the baby appears to have tense legs, the whole body, may also be suffering from epilepsy, the baby’s brain will appear abnormal discharge, resulting in epilepsy, the emergence of generalized tonic spasms, tense legs, teeth closed, may be accompanied by the loss of consciousness. 3. Cerebral palsy: Cerebral palsy is mostly caused by brain injury during childbirth or trauma to the skull after childbirth. Clinical manifestations of cerebral palsy include hypertonia, stiffness of limbs, and partially hypotonia, accompanied by weakness of limbs. If the baby appeared legs straight, the whole body to make the situation, it is recommended to closely observe, abnormalities in a timely manner to seek medical attention, follow the doctor’s instructions for symptomatic intervention.