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Both aspirin and paracetamol reduce fever but aspirin should not be given to children under 12. Liquid paracetamol such as Calpol is recommended for young children.
However since fever is a response to your body's immune system fighting bacteria or viruses there is some suggestion it is best not to try to reduce fever but only to reduce discomfort by applying a tepid damp cloth to the forehead to reduce a high temperature.
If a baby has a high or persistent fever or fever is accompanied by listlessness, palour or quickened breathing you should see a doctor.