Fever in children: when to worry and when to see a doctor

Last reviewed 2026-09-24

My child has a fever — when should I worry?

A fever is 38°C (100.4°F) or higher. Any fever in a baby under 3 months, or fever with lethargy, breathing difficulty, a rash that doesn't fade, or signs of dehydration needs same-day medical review.

At home

Offer plenty of fluids; ORS if there is diarrhoea
Light clothing, rest
Paracetamol only at the dose your doctor advised for your child's weight
Never give aspirin to children

When to see a paediatrician

Any fever under 3 months of age
Fever lasting more than 3 days
Fits, stiff neck, rash that doesn't fade when pressed
Fast or difficult breathing, very drowsy, no urine for 6–8 hours

Sources

NICE – fever in under 5s
WHO – IMCI guidance

This guide is general information, not medical advice. Always consult your child's doctor.

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