After 3 years old child has a fever, appear hands and feet is cold how is trembling to return a resp

After the child has a fever, the hands and feet are cold and trembling. It is considered that under the action of heat source, the central set point rises, the muscles of the whole body contract and produce heat, and the peripheral circulation of the limbs is not good, so the symptoms of cold hands and feet and trembling will appear. You can rub the hands and feet properly, or put the hands and feet into the hot water basin, so as to relieve the symptoms.