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The normal temperature inside your childâs body is usually around 37 degrees Celsius. Your child has a mild fever if their temperature is higher than 38 degrees Celsius. A high fever usually means more than 39 degrees Celsius.
Knowing When to Go to the Doctor. 1  1. Recognize the symptoms of a fever. Not everyoneâs normal body temperature is exactly 98.6 Â°F (37.0 Â°C). 2  2. Call the doctor if the fever is high. Adults should go to the doctor with a fever higher than 103 Â°F (39 Â°C). 3  3. Call the doctor if the fever lasts more than a few days.