The reason why the newborn baby leg shaking, generally caused by the following two aspects: 1, normal phenomenon: the baby was just born soon, the development of the nervous system is imperfect, the cerebral cortex development is immature, the central nervous cell excitability is high, in the temperature change, bright light, vibration stimulation, easy to cause nerve excitation, easy to appear limb shaking situation, sometimes accompanied by crying. Coupled with the baby’s nerve to muscle innervation control is incomplete, so it will lead to the baby’s hands and feet shaking situation. With the growth of the age of the month, the continuous development of the nervous system, this phenomenon will slowly disappear. 2, pathological phenomenon: if the baby in the birth process occurred in the brain injury, due to the degree of injury is relatively mild, there will be excessive excitement, irritability, muscle tone is slightly high, causing limb shaking. It is recommended to consult a doctor immediately to identify the cause of the disease and give symptomatic treatment.