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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.
1 For children, a body temperature above 38 degrees Celsius/100.4 Farenheit (rectally) is considered as a fever. 2  High Fever. 3  A high fever is considered as a body temperature equal to and above 40 degrees Celsius/104 degrees Farenheit. In infants younger than 8 weeks, a body temperature greater than 38.3 degree Celsius/101 degrees Farenheit should be considered as a high fever and requires prompt immediate medical attention.