Fever management in young children

The question

A temperature of 38.5°C at 2 a.m. is one of parenthood's most universal scares. Should you bring the fever down? Which medicine? What temperature means danger? And what about seizures? This topic covers what the evidence says about managing fever at home and how to recognise when a feverish child needs urgent care.

Short answer

Fever (38°C or above) is a symptom, not an illness — and at typical childhood temperatures it is rarely harmful in itself. Treat the child's distress, not the number on the thermometer: offer paracetamol or ibuprofen if your child is uncomfortable, and either medicine is fine (there is no convincing evidence that one is better). Don't give both at the same time, don't routinely alternate them, and don't sponge or strip your child to cool them. Antipyretics do not prevent febrile seizures.

The evidence rating is B: national guidance, systematic reviews of randomised trials, and observational prognosis data agree on the core advice, though questions remain about parental outcomes and whether lowering fever changes the illness itself.

Key numbers at a glance

• Fever = 38°C or above. Treat distress, not the number [1 — B].
• Paracetamol and ibuprofen: follow the product label or your pharmacist for dose, timing and age limits — strengths vary [6 — C].
• Febrile seizures: 2–5 in 100 children; about 1 in 3 have a recurrence; later epilepsy roughly 2–7 in 100 (lower after simple seizures) vs ~1 in 100 generally [4 — C].
• Seek urgent care for: under 3 months + ≥38°C, non-blanching rash, or any red traffic-light feature [1 — B].

What the strongest evidence says

Treat distress, not temperature. NICE's guidance on fever in under-5s (NG143) is explicit: consider paracetamol or ibuprofen when a child is distressed, not solely to bring down the temperature; keep giving it only while the child seems distressed; do not give both medicines at the same time; and only consider switching to the other medicine if distress persists or comes back before the next dose is due [1 — B].

Paracetamol vs ibuprofen: no winner. A systematic review of 8 randomised trials (1,632 children) found both medicines effective at reducing temperature, with no convincing evidence that either is superior — six of the eight studies leaned slightly toward ibuprofen, but the trials were too heterogeneous for a firm conclusion [2 — B]. A meta-analysis of combined or alternating therapy found only small temperature differences and concluded the evidence does not justify routine combined treatment [3 — B].

Antipyretics don't prevent febrile seizures. NICE guidance states this directly: intermittent antipyretics do not prevent recurrence of febrile seizures [1 — B].

Sponging and stripping don't help. Tepid sponging is not recommended — it doesn't cool effectively and distresses the child. Don't underdress a shivering child or overwrap a sweating one; dress them for comfort [1 — B].

Age and medicine rules (UK): paracetamol and ibuprofen come in different strengths, and age limits vary between products — always follow the dose and timing on the product label or your pharmacist's advice for your child's age and weight. As a rough guide, paracetamol is licensed from around 2 months and ibuprofen from 3 months, but check the label: some products set higher age or weight limits. Avoid ibuprofen with chickenpox, or if your child is dehydrated or has had very few wet nappies, unless a clinician advises otherwise [6 — C].

When fever needs urgent assessment

NICE's traffic-light system classifies the risk of serious illness. Any red feature means high risk — seek urgent care (999/A&E for life-threatening features; urgent face-to-face assessment within 2 hours for other red features) [1 — B].

Red features to watch for at home:

• Age under 3 months with a temperature of 38°C or higher
• A non-blanching rash (press a clear glass against it — if the spots don't fade, that's non-blanching)
• Bulging fontanelle (the soft spot on a baby's head), neck stiffness
• Does not wake, or if roused does not stay awake; no response to social cues
• Weak, high-pitched or continuous cry; grunting
• Pale, mottled, ashen or blue skin, lips or tongue
• Breathing difficulty: respiratory rate above 60 breaths per minute, moderate or severe chest indrawing

Amber features (intermediate risk — get a clinician's assessment, urgency by clinical judgement): age 3–6 months with temperature 39°C or higher; fever lasting 5 days or more (children with fever for 5+ days should be assessed for Kawasaki disease); no smile; decreased activity; poor feeding; reduced urine output; dry mouth/tongue. A rash on its own is not an amber feature — but a non-blanching rash is a red feature (see above). Children with only green features can be cared for at home with safety-netting advice [1 — B].

NICE also expects clinicians to weigh the wider picture when deciding about hospital assessment: your anxiety and instinct as a parent, family circumstances, repeated healthcare contacts for the same illness, and a family history of serious febrile illness all legitimately count — they are written into the guideline, not extras you have to justify [1 — B].

Also note: after an antipyretic, a falling (or not falling) temperature tells you nothing about whether the illness is serious — don't use it to decide [1 — B].

What remains uncertain

Does bringing down the fever change the illness? Fever is part of the immune response — a regulated rise in body temperature that is generally considered a beneficial host defence mechanism — and no good trial has shown that lowering temperature shortens a simple viral illness or improves anything other than comfort [8 — C]. Comfort is the outcome that matters, which is why guidance targets distress rather than the thermometer reading [1, 3 — B].

How big the parental toll is. Parent anxiety, sleep loss and missed work during febrile illness are barely measured in trials — see the parental section below.

Benefits and risks in absolute terms

• Febrile seizures: roughly 2–5 in 100 children will have at least one. Of those who have a first seizure, about 1 in 3 will have another (more likely if the first happened before 18 months) [4 — C].
• Epilepsy after febrile seizures: roughly 2–7 in 100 overall (toward the lower end after simple seizures; about 5 in 100 after complex ones), compared with about 1 in 100 in children who never had one — a small absolute increase. Simple febrile seizures do not increase the risk of death or intellectual disability [4 — C].
• Antipyretic harms: both paracetamol and ibuprofen are safe at recommended doses. The real risks are dosing errors — especially when alternating two medicines — and overdose. Measure doses with the syringe provided, never a kitchen spoon [6 — C].
• What medicine cannot do: antipyretics do not prevent febrile seizures, and a temperature that doesn't come down with medicine is not by itself a sign of serious illness [1 — B].

These seizure figures apply to simple febrile seizures (brief, generalised, one in 24 hours). Complex or prolonged seizures are a different clinical situation — talk to your doctor.

Practical considerations

• Measuring temperature: in babies under 4 weeks, use an electronic thermometer in the armpit. From 4 weeks to 5 years, an electronic or chemical-dot thermometer in the armpit, or an infra-red tympanic (ear) thermometer, are the recommended methods. Forehead chemical thermometers are unreliable [1 — B]. A parent's sense that their child has a fever should be taken seriously, even without a thermometer reading [1 — B].
• At home: offer plenty of fluids; dress for comfort; let a sleeping child sleep — do not wake them to give medicine. If you gave one medicine and distress returns before the next dose is due, you may try the other, but don't keep alternating routinely [1, 6 — B].
• The glass test: with any rash plus fever, press a clear drinking glass firmly against the spots. If they don't fade, treat it as an emergency [1 — B].
• If a seizure happens: stay calm, note the time, keep your child safe from injury, and don't put anything in their mouth. Call 999 if the seizure lasts longer than 5 minutes or your child doesn't recover quickly. A first febrile seizure should be reviewed by a doctor [4 — C].
• Childcare and school: keep a feverish child home until the fever settles and they feel well enough; notify the nursery or school.
• A plan for the night: decide in advance — who gets up first, where the thermometer and medicine live, and what your threshold is for calling 111. Writing it down (even as a phone note) sounds excessive at 7 p.m. and feels like genius at 3 a.m. Agree that a sleeping, comfortable child is left alone: waking them to dose is one of the behaviours the guidelines specifically push against [1, 5 — B].
• After the fever: most viral fevers last 2–3 days. Appetite returns before energy does — that's normal. The 5-day mark is the one to remember: fever persisting that long needs a clinical assessment even if your child seems okay [1 — B].

What it means for the parents

Fever terrifies parents out of proportion to its danger — and that fear is well documented. In a US survey of 340 caregivers, 56% said they were very worried about fever's potential harm, 91% believed an untreated fever could cause harmful effects, 21% listed brain damage and 14% listed death as possible consequences; over half checked the temperature at least every hour, and 85% said they would wake a sleeping child to give medicine [5 — C]. Paediatricians call this "fever phobia," and it has barely changed in decades. There is a small, encouraging counterpoint: in one emergency-department study, written and video education raised the share of caregivers who could correctly define a significant temperature (38°C) from 41% to 94% — a knowledge gap that clear information can close, though this was a single small study measuring knowledge, not outcomes [7 — C].

What this means in practice:

• Sleep: feverish nights are broken nights — temperature checks, medicine rounds, and a clingy miserable child. No trial quantifies this, but it is one of the commonest reasons parents present to out-of-hours services. The guideline-consistent approach (treat distress, let sleeping children sleep) is also the approach that protects your own sleep [1, 5 — B].
• Mental health and anxiety: if your worry about fever is constant or spiralling — repeatedly seeking reassurance, checking temperatures every few minutes — that level of anxiety deserves attention in its own right. NICE guidance lists parental anxiety and instinct as legitimate factors in admission decisions; clinicians take it seriously, and so should you [1 — B].
• Work and childcare: fever means days off work or cancelled plans, often at short notice and repeatedly through the winter viral season. This burden is real and entirely unmeasured in the trials — one of the evidence gaps this topic flags openly.
• Relationships: night-time fever duty tends to fall unevenly. Agree in advance who does what at 3 a.m.; decision fatigue plus sleep deprivation is a classic argument starter.

When to talk to your doctor, midwife, or pediatrician

• Any red feature listed above — seek urgent care.
• Amber features — get a same-day clinical assessment.
• Fever lasting 5 days or more, even if your child otherwise seems well (Kawasaki disease needs ruling out).
• You are worried. Parental concern is itself a valid reason to seek care.

This topic is information, not medical advice. If in doubt about a feverish child, contact NHS 111, your GP, or in an emergency call 999.

References

1. NICE NG143. Fever in under 5s: assessment and initial management. https://www.nice.org.uk/guidance/ng143/chapter/Recommendations — [evidence rating B]
2. Narayan K et al. J Paediatr Child Health. 2017. DOI: 10.1111/jpc.13507 — [evidence rating B]
3. Combined/alternating antipyretics meta-analysis. Front Pediatr. 2019. DOI: 10.3389/fped.2019.00217 — [evidence rating B]
4. NHS febrile-seizure guidance: St George's University Hospitals NHS Foundation Trust, Febrile Convulsions: Information for Parents (about 1 in 3 have a recurrence; epilepsy risk 2.0–7.5% overall, about 5% after complex seizures; call 999 if a seizure lasts longer than 5 minutes; first seizure should be reviewed by a doctor). NICE Clinical Knowledge Summary on febrile seizure (revised January 2024: about one-third have recurrent seizures; generally benign). Royal Cornwall Hospitals NHS Trust guideline (affects 2–5% of children; simple seizures typically last 2–3 minutes, benign). https://www.stgeorges.nhs.uk/wp-content/uploads/2024/12/PAM_FC.pdf — [evidence rating C]
5. Crocetti M et al. Pediatrics. 2001;107:1241 — [evidence rating C]
6. NHS guidance: RUH pain relief for children leaflet; Nottinghamshire APC fever self-care leaflet; West London Healthier Together fever pages — [evidence rating C]
7. Lynch et al. Paediatr Res. (reported in PMC11257938) — [evidence rating C]
8. El-Radhi ASM. Fever management: Evidence vs current practice. World J Clin Pediatr. 2012 (via scoping review PMC6650695) — [evidence rating C]

Changelog

• 2026-09-08: Topic created (draft). Awaiting independent clinical review. (Superseded 2026-09-09: author-review model, no external review before v1.)
• 2026-09-09: Author review (delegated agent, author-review model). Corrected amber list (removed generic "rash with fever" — not an amber feature per NICE NG143); replaced detailed dosing with label/pharmacist guidance; re-sourced febrile-seizure prognosis from official NHS guidance (St George's leaflet, NICE CKS, Cornwall guideline) replacing the AAFP secondary summary; removed unverified "50 in 100 recurrence if first before 12 months"; added during-seizure first-aid bullet (call 999 if >5 minutes; first seizure reviewed by doctor); approved (B).