The baby fever body shaking to consider is physiological factors, fever convulsions and shock early causes. 1. Physiological factors: small children fever shaking, generally because the small children nervous system is not well developed, during the fever because of increased nerve sensitivity to the phenomenon of jumping and shaking. If the ambient temperature is too low, wearing too little, poor warmth, the baby will also appear body shaking. 2. Febrile convulsions: baby fever body shaking may also be caused by febrile convulsions, due to high body temperature, affecting the function of the center, causing muscle contraction phenomenon. 3. Shock early: shock early for compensatory shock stage, patients with poor peripheral circulation performance, persistent high body temperature but peripheral circulation continues to be bad, there will be a baby fever body shaking phenomenon. The baby fever body shaking, there may be other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.