Normal human axillary body temperature is generally 36 ~ 37 ℃, small children body temperature 37.8 ℃ for fever. Causes of fever in children are many, clinically can be divided into infectious and non-infectious two categories. 1. Infectious: various pathogens such as viruses, bacteria, mycoplasma, fungi, parasites, rickettsiae and other infections, whether acute, subacute or chronic, local or systemic, can appear fever. 2. Non-infectious: aseptic inflammation, antigen-antibody reaction, endocrine and metabolic diseases, skin heat loss reduction, thermoregulatory center malfunction, autonomic dysfunction and other causes. Pediatric body temperature of 37.8 ° C is considered infectious fever, it is recommended to regular hospitals to find a professional doctor to identify the cause of fever after systematic diagnosis and treatment, do not be negligent and delay the child’s condition.