The fastest way to break a fever in a child is to give a weight-based dose of a fever-reducing medication, keep them lightly dressed, and push fluids. A fever is any rectal or ear temperature of 100.4°F (38°C) or higher, an oral temperature of 100°F or higher, or an armpit temperature of 99°F or higher. Most childhood fevers resolve within a few days and are the body’s normal response to infection, but there are practical steps you can take to bring the temperature down and keep your child comfortable.
Fever-Reducing Medication by Age
Two over-the-counter medications are safe for most children: acetaminophen (Tylenol) and ibuprofen (Advil, Motrin). Both are dosed by your child’s weight, not age, so check the packaging chart or ask your pharmacist if you’re unsure. Children’s liquid acetaminophen comes as 160 mg per 5 mL and can be given every 4 hours, with no more than 5 doses in 24 hours. Ibuprofen can be given every 6 to 8 hours. The key difference: ibuprofen is not approved for babies under 6 months old.
Never give aspirin to a child or teenager. Aspirin use during a viral illness like the flu or chickenpox is linked to Reye’s syndrome, a rare but serious condition where ammonia and acid levels in the blood rise, the liver swells, and dangerous brain swelling can follow.
Alternating Acetaminophen and Ibuprofen
Many parents alternate between the two medications, and a large analysis published in the journal Pediatrics found this approach is effective. By the four-hour mark, children who received alternating or combined doses were significantly more likely to be fever-free compared to those given acetaminophen alone. The analysis also found no difference in side effects between single-drug and dual-drug approaches when used at proper doses for a short period.
That said, alternating two medications increases the chance of a dosing mix-up, so keep a written log of what you gave and when. Avoid ibuprofen if your child is dehydrated or at risk of dehydration, because it can stress the kidneys. Children with chickenpox should also skip ibuprofen, as it may raise the risk of severe skin infections.
Fluids and Hydration
A fever speeds up fluid loss. Children who are also vomiting or have diarrhea lose fluids even faster and need extra water or an oral rehydration solution (like Pedialyte) at the first sign of illness. For older kids, water, diluted juice, broth, and popsicles all count.
Watch for signs of dehydration: no wet diapers for three hours, a dry mouth, no tears when crying, sunken eyes, skin that doesn’t bounce back quickly when gently pinched, or unusual crankiness or sleepiness. A rapid heart rate is another warning sign. If you notice several of these together, your child needs medical attention.
Clothing and Room Temperature
Dress your child in a single light layer of comfortable clothing or pajamas. Bundling a feverish child in blankets or extra layers traps heat and can push the temperature higher. A comfortable room temperature is fine. If your child is shivering, a light blanket is okay until the shivering passes, but remove it once they warm up.
Lukewarm Sponge Baths
A sponge bath can help bring a fever down without medication, or alongside it. Use lukewarm water between 90°F and 95°F (32°C to 35°C). Sponge your child gently for 20 to 30 minutes. The evaporating water draws heat away from the skin.
Three things to avoid: cold water, ice, and rubbing alcohol. All three cool the body too quickly, which can trigger intense shivering. Shivering actually raises your child’s core temperature, working against you. If your child starts to shiver during the bath, stop and dry them off.
Special Rules for Babies Under 3 Months
A fever in a baby younger than 3 months is treated very differently. Any rectal temperature of 100.4°F or higher in this age group warrants an immediate call to your pediatrician or a trip to the emergency department. Young infants have immature immune systems, and a fever can be the only visible sign of a serious bacterial infection. Doctors will typically run blood and urine tests, and babies under 3 weeks old are almost always admitted for observation and started on antibiotics while waiting for results.
Do not give fever-reducing medication to a baby this young and assume everything is fine. The medication may bring the temperature down, but it won’t treat a potential underlying infection, and it can mask symptoms that doctors need to see.
When a Fever Needs Emergency Care
Most fevers in children over 3 months are caused by common viruses and resolve on their own. But certain symptoms alongside a fever signal something more serious. Head to the emergency department or call 911 if your child has a fever with any of the following:
- Extreme drowsiness or difficulty waking up
- A stiff neck
- A new rash
- Trouble breathing
- Inconsolable crying
- Excessive drooling or difficulty swallowing
- Abdominal pain or tenderness
- Altered speech or trouble walking
- Blue lips, tongue, or nails
Also call your pediatrician if a fever lasts more than two or three days, keeps returning, or if your child just doesn’t seem right to you. Parental instinct is a valid reason to seek care.