Fever in Children: Dosing, Sponging Myths and the Danger Signs
Fever in a child causes more parental anxiety than almost anything else, and much of the standard home response is unhelpful or actively harmful. The number on the thermometer matters far less than how the child looks and behaves.
What fever is
Fever is a regulated rise in body temperature produced by the immune system in response to infection. It is a defence mechanism, not the disease. In itself, a fever up to around 40 degrees does not damage the brain or organs.
Fever is defined as a temperature of 38.0 degrees Celsius or above, measured rectally in infants or by a reliable method in older children. Axillary readings run roughly 0.5 degrees lower than core.
Measuring correctly
- Under 3 months: rectal is the reference standard; axillary is acceptable for screening
- 3 months to 5 years: axillary digital, or infrared tympanic in children over 6 months
- Over 5 years: oral, axillary or tympanic
- Avoid mercury thermometers and forehead strips, which are inaccurate
- Do not measure immediately after a bath, a hot drink, or while the child is bundled up
Treatment
Treat the discomfort, not the number. A child with 39 degrees who is playing, drinking and alert needs fluids and observation more than medicine. A child with 38.3 who is miserable may well benefit from an antipyretic.
Paracetamol: 15 mg per kilogram per dose, every 4 to 6 hours, maximum four doses in 24 hours. This weight-based dose is essential; dosing by age is a common cause of under-dosing, and under-dosing is the usual reason parents conclude the medicine “does not work”.
Ibuprofen: 10 mg per kilogram per dose, every 6 to 8 hours, for children over 6 months. Avoid if the child is dehydrated, vomiting persistently, has kidney problems, or if dengue is suspected or circulating in the area.
Do not alternate the two routinely. It increases dosing errors without clear benefit. Use one, correctly dosed, and switch only on medical advice.
Never give aspirin to a child with a fever, because of the risk of Reye’s syndrome.
Always check the concentration on the bottle, as paediatric syrups come in different strengths, and use the measuring device supplied rather than a kitchen spoon.
Things to stop doing
Cold water or ice sponging. This causes shivering, which raises core temperature, and causes distress. If sponging at all, use lukewarm water, and only after an antipyretic has been given.
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Rubbing with alcohol or spirit. This is absorbed through the skin and can cause poisoning. It should never be used.
Bundling the child in blankets to “sweat out” the fever. This traps heat. Dress lightly in a comfortably cool room.
Starving a child with fever. Appetite drops, which is normal, but fluids must continue.
Giving antibiotics from a previous illness. Most childhood fevers are viral, and leftover antibiotics delay proper diagnosis.
What actually helps
- Frequent small amounts of fluid: breast milk, ORS, water, diluted juice, soups, coconut water. Watch urine output as the best hydration gauge
- Light clothing and a room at a comfortable temperature
- Rest, without forcing bed rest if the child wants to play quietly
- Food if wanted, not forced
Danger signs needing medical attention the same day
Any fever in an infant under 3 months is an emergency, regardless of how well the baby appears, because serious infection can be present with few signs.
For older children, seek urgent care for:
- Difficulty breathing, rapid breathing, grunting, chest indrawing or nasal flaring
- A rash that does not fade when pressed with a glass
- Neck stiffness, severe headache, dislike of light
- A bulging fontanelle in an infant
- Drowsiness, difficulty waking, confusion, or a weak high-pitched cry
- Seizure
- Persistent vomiting, or inability to keep fluids down
- Signs of dehydration: dry mouth, no tears, sunken eyes, reduced urine or fewer than three wet nappies a day, lethargy
- Cold, mottled or blue hands and feet, or pale or blue lips
- Severe abdominal pain
- A limb the child will not move or bear weight on
- Fever lasting more than five days
- Fever in a child with a chronic illness, immune suppression, or sickle cell disease
- Any child who simply looks seriously unwell to you, whatever the thermometer says
That last point deserves emphasis. Parental instinct that a child is not right is a recognised and reliable warning sign, and should not be dismissed because the temperature is only moderate.
Febrile seizures
These occur in about 2 to 5 percent of children between 6 months and 5 years, typically with a rapid rise in temperature. They are frightening but usually harmless and do not cause brain damage or epilepsy in the typical simple form.
What to do: place the child on their side on a safe flat surface, loosen clothing, remove nearby objects, note the time, and do not put anything in the mouth or restrain them. Most stop within two to three minutes.
Call emergency services if the seizure lasts more than five minutes, if another follows, if breathing is difficult, if the child does not recover normally afterwards, or if it is the first such episode.
Giving antipyretics does not prevent febrile seizures, so there is no reason to medicate purely for that purpose.
This is general information. Any fever in an infant under three months, or any child who looks unwell, needs a doctor rather than home management.