In general I only give paracetamol suspension for pain (and have to be sure on this one as DD1 likes the taste) and if fever over 39 degrees in child, 38 degrees in baby.
I have this book. In it Dr Mendleson says ?If your child contracts an infection, the fever that accompanies it is a blessing, not a curse. The spontaneous release of pyrogens cause the body temperature to rise, a natural defense mechanism needed to fight disease. The presence of fever tells you that the repair mechanisms of the body have gone into high gear. It is something to rejoice over, not to fear.?
They have just come out and said that a quarter of all adults are overdosing on paracetamol. Some children are being overdosed too as Calpol and the like are now seen as a 'cure-all' (NB: acetaminophen and paracetamol are the same thing).
Even if you stick to the prescribed dosage on the bottle, if your child is on the lower end of the centiles then you could be overdosing without realising it as weight of child and concentration of solution affect dosage.