Newborn fever of 38.5 degrees may be related to bacterial infection, viral infection and other factors. Because the newborn’s body is relatively weak, the immune function development is not yet perfect, so often by bacterial infection, viral infection and mycoplasma infection and other pathogens invasion, after being infected by the above pathogens, will directly stimulate the thermoregulatory center, so that the fever of 38.5 degrees of the situation. Bacterial infections and mycoplasma infections will generally recover slowly after taking relevant antibiotic treatment. Viral infections do not have specific drugs, in addition to symptomatic medication, usually pay attention to the care, usually about 3 days to 4 days will be cured on their own. Parents in the discovery of newborns if the temperature reaches 38.5 ℃, it is necessary to promptly go to the hospital for routine blood tests, clear cause of the disease and then actively treat the symptoms, so as not to delay the disease.