One year old baby fever 38.5 ℃, the first need to reasonable antipyretic, such as the use of ibuprofen and other drugs, can reduce discomfort, and at the same time need to be clear as soon as possible to cause fever causes, such as toddler emergency rash, and treatment. For one year old babies with elevated body temperature of 38.5 ℃, there may be generalized discomfort, increased respiration and other manifestations, the first need to correctly use antipyretic drugs (such as ibuprofen or acetaminophen) symptomatic antipyretic to reduce the feeling of discomfort, at the same time, can be used to increase the dissipation of heat by using lukewarm water to wipe, and so on. And should actively consult the doctor to identify the causes of fever, and treatment, such as toddler emergency rash, usually caused by herpes virus infection, can be seen in this age group of babies, the emergence of elevated body temperature, often high fever for 3 ~ 5 days, heat out of the rash, the treatment of symptomatic supportive treatment, generally do not need special treatment. However, if the infection is serious, antiviral therapy should be considered. All of the above medications should be used under the supervision of a physician. It is recommended to consult a specialist for evaluation and treatment.