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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.
In general, a baby has a fever when their body temperature exceeds 100.4Â°F, or 38Â°C. A child has a fever when their temperature exceeds 99.5Â°F, or 37.5Â°C. An adult has a fever when their temperature exceeds 99 to 99.5Â°F, or 37.2 to 37.5Â°C.