My two children just had a fever three days ago. And, their body's temperature were between 38.5 to 39.5 degrees Celsius constantly and this is actually the ideal range of a fever because this is the temperature range in which microbes will be killed.
Sometimes, the temperature momentarily raised to 39.9 degrees Celsius but it went down to 39.5 degrees Celsius.
After a day, the temperature started to drop, from 39.5 to 39, to 38.5 to 37.5 degree Celsius and finally back to normal temperature. The time taken was 1.5 days to 2 days and without any medication. For the past 3 years, my babies seldom visit doctor for medication. The only time I visited was at the request of my wife just to make sure the baby is all right.
There was one time my 3 years old child having fever below or toughing (40.5 °C) for past 12 hours despite taking medication. Doctor told me not to worry as my baby brain will not be "cooked".
Taking medication and antibiotic at young age is harmful to their kidneys and liver.
The Best Way to Treat a Fever
Contrary to popular belief, the best course of action is usually little or no action when it comes to fever.
Rather than working against it; trying to lower your temperature, you should work with it and allow it to run its course. The only time you need to worry or seek medical attention is if it rises very high, very fast. This could be a sign of an infection too serious for your body to handle.
Fever is an important part of the body's defence against infection. Most bacteria and viruses that cause infections in people thrive best at 98.6 °F. Many infants and children develop high fevers with minor viral illnesses. Although a fever signals that a battle might be going on in the body, the fever is fighting for the person, not against.
Brain damage from a fever generally will not occur unless the fever is over 107.6 °F (42 °C). Untreated fevers caused by infection will seldom go over 105 °F (40.5 °C) unless the child is overdressed or trapped in a hot place.
Febrile seizures do occur in some children. However, most febrile seizures are over quickly, do not mean your child has epilepsy, and do not cause any permanent harm..
Unexplained fevers that continue for days or weeks are called fevers of undetermined origin (FUO).