The symptoms of chills that appear after a child has a fever are mainly due to the contraction of blood vessels and muscles throughout the body caused by fever, which leads to blood reflux, resulting in reduced blood circulation in the extremities and lower skin temperature. If not treated in time, symptoms of hyperthermic convulsions can occur. Therefore, it is necessary to let the skin temperature of the limbs gradually rise in a short period of time, and you can take a warm water bath or soak in the bath, which will induce the gradual relaxation of blood vessels and muscle contraction through the conduction of water temperature, promote blood circulation, and help to alleviate the symptom of muscle spasm, and at the same time, take antipyretic agents orally to lower the body temperature, which is conducive to the prevention of the symptoms of convulsions.