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Fever is one of the prime reasons that parents call their children's doctors, and it is true that any fever in an infant younger than 3 months is cause for major concern, as there is a risk of serious bacterial infections. Also, a child who has a seizure with fever should be checked by a physician, at least the first time.
However, fever is actually a signal that an immune system is working well and in older children who do not appear to be particularly distressed, fever is a positive sign. It is evidence that the child has an active immune system. Fever does not harm your brain or your body, although it does increase your need for fluids.