The fastest way to lower your child’s fever is with a weight-appropriate dose of a fever reducer like acetaminophen or ibuprofen, combined with light clothing, plenty of fluids, and rest. But here’s something worth knowing first: fever itself isn’t dangerous in most cases. It’s your child’s immune system fighting off an infection. The goal isn’t to eliminate the fever entirely, but to make your child comfortable enough to rest, drink, and recover.
What Counts as a Fever
The number that defines a fever depends on how you take the temperature. A rectal, ear, or forehead reading of 100.4°F (38°C) or higher is a fever. For oral thermometers, the threshold is 100°F (37.8°C). Armpit readings run lowest, so anything at or above 99°F (37.2°C) counts.
For babies under 3 months, a rectal temperature of 100.4°F or higher is a medical emergency, even if your baby seems fine otherwise. Take them to the nearest emergency department immediately. For babies 3 to 6 months, a temperature up to 101°F (38.3°C) is less urgent but still warrants a call to your doctor if the baby seems unusually irritable, sleepy, or uncomfortable. Children 6 to 24 months with a fever above 101°F that lasts more than a day should also be seen, even without other symptoms.
Fever-Reducing Medication
Two over-the-counter medications work well for bringing down a child’s fever: acetaminophen (Tylenol) and ibuprofen (Advil, Motrin). They lower temperature by about 2 to 3 degrees within 30 to 60 minutes and help with the achiness that makes kids miserable.
Acetaminophen can be given every 4 hours, up to 5 doses in 24 hours, for children under 12. Children’s liquid syrup comes in a standard concentration of 160 mg per 5 mL. It should not be given to children under 2 without a doctor’s guidance. Ibuprofen can be given every 6 to 8 hours but is not safe for babies under 6 months old.
For both medications, dose by your child’s weight, not their age. The weight-based dose is more accurate and safer. Check the packaging or call your pediatrician if you’re unsure of the right amount.
Should You Alternate Between the Two?
Many parents have heard they should alternate acetaminophen and ibuprofen to keep a fever down around the clock. Research reviewed by the American Academy of Pediatrics found that alternating the two medications was about as effective as using either one alone. The real concern is that juggling two medications on different schedules makes dosing errors more likely. If your child’s fever responds to one medication, stick with that one. If it doesn’t, talk to your pediatrician before adding the second.
Non-Medication Ways to Help
Medication isn’t always necessary, especially if your child’s temperature is only mildly elevated and they’re still playing, eating, and drinking. Several simple measures can bring comfort and help the body cool itself naturally.
Lukewarm sponge bath. Use water between 90°F and 95°F (32°C to 35°C). Sponge your child gently for 20 to 30 minutes. If they start shivering, stop immediately. Shivering actually raises core body temperature, which defeats the purpose.
Light clothing. Dress your child in a single layer of comfortable clothes or light pajamas. Bundling a feverish child in extra blankets or heavy clothing traps heat and can push their temperature higher. It’s a natural instinct to pile on layers when your child has chills, but resist it.
Fluids, fluids, fluids. Fever increases water loss through the skin. For every degree above 100.4°F, your child’s body is evaporating more fluid than usual. Offer water, diluted juice, popsicles, soup, or an oral rehydration solution frequently in small sips. A child who is peeing less than usual, has a dry mouth, or produces no tears when crying may be getting dehydrated.
What Not to Do
Two old remedies are genuinely dangerous and should never be used on children.
Never apply rubbing alcohol to the skin. This was common advice decades ago, but rubbing alcohol absorbs through a child’s skin and enters the bloodstream. In small bodies, this can cause alcohol poisoning, irregular heartbeat, seizures, coma, and even death. It is not a safe cooling method at any age.
Never use cold or ice baths. A cold bath can cause shivering so intense that it actually raises your child’s internal temperature. Lukewarm water is the only safe option for a cooling bath.
You should also avoid giving aspirin to anyone under 18. Aspirin in children is linked to a rare but serious condition that affects the brain and liver.
Getting an Accurate Temperature
The reading you get varies depending on where you place the thermometer. Rectal thermometers give the most reliable core temperature and are the recommended method for babies and toddlers. Forehead (temporal artery) and ear thermometers are convenient for older children but can be thrown off by sweat, earwax, or poor positioning. Armpit readings are the least accurate and tend to read about 1 to 1.5 degrees lower than rectal.
If you’re using a forehead or armpit thermometer and the reading seems borderline, consider rechecking with a rectal thermometer for children under 3, or an oral thermometer for children old enough to hold it under their tongue with their mouth closed for a full minute.
When a Fever Needs Medical Attention
Most fevers in children resolve on their own within two to three days as the underlying virus runs its course. But certain warning signs mean you should get medical help right away:
- Any fever in a baby under 3 months old
- Fever above 104°F (40°C) at any age
- Fever lasting more than 2 days without improvement
- A rash appearing alongside the fever
- Vomiting so persistent your child can’t keep fluids down
- Sensitivity to light or ongoing headache
- A bulging soft spot on a baby’s head
- A febrile seizure (convulsion triggered by fever)
Call emergency services if your child is drowsy and difficult to wake, has trouble breathing, or has a stiff neck. These can be signs of a serious infection that needs immediate treatment.
Children with weakened immune systems from a medical condition or treatment should be seen by a doctor for any fever above 100.4°F, since their bodies may not fight infections effectively on their own.