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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.
Most people think a normal body temperature is an oral temperature (by mouth) of 37Â°C (98.6Â°F) . This is an average of normal body temperatures. Your normal temperature may actually be 0.6Â°C (1Â°F) or more above or below this. fever may occur as a reaction to: 1  Infection. 2  This is the most common cause of a fever. 3  Infections may affect the whole body or one body part. 4  Medicines. 5  These include antibiotics, narcotics, antihistamines, and many others. 6  This is called a drug fever.. 7  Medicines like antibiotics raise the body temperature directly.