The fever of 39.5 degrees in 11-month-old babies is mostly due to infections, and the treatment measures include cooling treatment and anti-infection treatment. 1. Cooling treatment: fever 39.5 degrees belongs to the category of high fever, need to be in the whole body on the basis of warm water bath physical cooling, follow the doctor’s instructions to give medication to cool down, such as oral acetaminophen oral solution or ibuprofen suspension, etc., to help babies as soon as possible to lower the body temperature. Remember to follow the doctor’s instructions strictly. 2. Treatment for the cause: most of the fever in infants is caused by infected foci in the body, and it is necessary to clarify the type of infection as soon as possible, and give symptomatic medication according to the doctor’s instructions. (1) If it is caused by a virus, no special medication is needed. Let the infant pay more attention to rest, ensure sleep, to light supplemental food, drink more warm water, can help shorten the course of the disease. (2) If there is a combination of bacterial infection, antibacterial drugs such as cefixime and amoxicillin should be used according to the doctor’s instructions. Remember to keep track of the adverse reactions and precautions etc. of the drugs. There are more causes of fever of 39.5 degrees in 11-month-old babies, parents should pay attention to it and take their children to the hospital in time for standardized treatment. All of the above medications should be used under the guidance of a doctor, avoid self-medication.