Cold and fever in young children may be related to the emergence of pyrogens in the body, poor thermoregulation and other factors. Colds in young children are mainly due to the invasion of viruses, bacteria and other pathogens, so that the mucous membrane of the upper respiratory tract is congested, edema, inflammatory substances exudation of inflammatory response, at this time will activate the body’s immune response, the body’s metabolism is accelerated, the inflammatory factor increases, resulting in the emergence of pyrogens, pyrogens caused by thermoregulation of the neural center of thermoregulation of the regulatory point of the upward movement of the fever will occur. Infants and young children because of their age is relatively small, the function of the thermoregulatory center is relatively poor, can not control the body temperature well, once the cold by the invasion of pathogenic bacteria, the body temperature can not be maintained in the normal range, there will be a fever. Young children with colds and fevers should be handled in a timely manner according to the changes in body temperature, so as not to affect the health of the organism when the body temperature is high or ultra-high fever.