🤒 What Is A Fever? A fever is a sign that your body is fighting an infection. A fever is not an illness, it means your body is responding to an illness. A fever usually goes away within 3 days. The following values below will help you determine if your child has a fever depending on where and how you take their temperature.🌡 Normal Rectal Temp:36.6 to 38°C or 97.9 to 100.4°F🌡 Normal Armpit Temp:36.5 to 37.5°C or 97.8 to 99.5°F🌡 Normal Mouth Temp:35.5 to 37.5°C or 95.9 to 99.5°F🌡 Normal Ear