A toddler has a fever when their rectal, ear, or forehead temperature reaches 100.4°F (38°C) or higher. Most fevers in toddlers are caused by common viral infections, resolve on their own within a few days, and can be managed safely at home with fluids, rest, and careful monitoring. Your main job is to keep your child comfortable, watch for warning signs, and know when to call the pediatrician.
How to Take an Accurate Temperature
The thermometer you use matters. A rectal thermometer gives the most accurate reading for children under 3, since it measures internal body temperature directly. If that feels intimidating, an ear thermometer works well for children 6 months and older, though you’ll want to make sure earwax isn’t blocking the canal and that your child hasn’t just come in from the cold. Wait five to ten minutes indoors before using an ear thermometer.
Forehead thermometers are convenient but less reliable. Sweating or recent time outdoors can throw off the reading. Armpit readings are the least accurate of all, since the skin there isn’t close enough to major blood vessels. If you use the armpit method, add half a degree to a full degree Fahrenheit to get closer to the true temperature.
Here’s what counts as a fever based on where you measure:
- Rectal, ear, or forehead: 100.4°F (38°C) or higher
- Oral: 100°F (37.8°C) or higher
- Armpit: 99°F (37.2°C) or higher
Keeping Your Toddler Comfortable
A fever itself isn’t dangerous in most cases. It’s your child’s immune system fighting off an infection. So the goal isn’t necessarily to eliminate the fever but to help your toddler feel better while their body does its work.
Dress your child in lightweight clothing and keep the room at a comfortable temperature. A single layer and a light blanket for sleep is usually enough. Skip the heavy pajamas and extra blankets, which can trap heat. A lukewarm (not cold) bath can also help bring some relief, but stop if your child starts shivering, since shivering actually raises body temperature.
Fluids Are the Priority
Fever increases fluid loss, and toddlers can become dehydrated faster than adults. The higher the fever, the more fluid your child needs. This becomes especially serious if your toddler also has diarrhea or vomiting, which compound fluid loss quickly. Offer water, breast milk, formula, or an oral rehydration solution frequently throughout the day. Small, frequent sips work better than trying to get your child to drink a large amount at once.
Watch for these signs of dehydration:
- Fewer wet diapers: no wet diaper for three hours or longer
- Dry mouth or cracked lips
- No tears when crying
- Sunken eyes or a sunken soft spot on top of the head
- Skin that stays pinched instead of flattening back right away
- Unusual crankiness or lack of energy
If you notice several of these signs together, call your pediatrician promptly.
Fever-Reducing Medication
Acetaminophen (Tylenol) can be given to toddlers to reduce fever and ease discomfort. The standard children’s liquid contains 160 mg per 5 mL, and dosing is based on your child’s weight. If you don’t know their current weight, use their age as a guide from the packaging. You can give it every four hours as needed, but no more than five doses in a 24-hour period.
Ibuprofen (Motrin, Advil) is another option for children 6 months and older. Like acetaminophen, dose it by weight rather than age when possible.
A few important rules: never give aspirin to a child, as it’s linked to a rare but serious condition. Don’t give acetaminophen to children under 2 without first checking with your pediatrician. And avoid extra-strength or extended-release formulas, which are not designed for young children.
What About Teething Fevers?
Many parents assume a fever means their toddler is teething. The research on this is actually mixed. A large systematic review found no clear association between fever and tooth eruption overall, though some studies using rectal temperatures did find a modest link. The takeaway: teething might cause a very slight rise in temperature, but it shouldn’t cause a true fever of 100.4°F or higher. If your toddler has a real fever, assume something else is going on, likely a viral infection, and treat it accordingly. Blaming a high fever on teething risks missing an actual illness.
When to Call Your Pediatrician
Most toddler fevers don’t require a doctor visit, but certain situations do. Call your pediatrician if your child is 6 to 24 months old and has a fever above 100.4°F that lasts more than one day. For children 3 to 6 months old, call if they have any temperature of 100.4°F or higher, or if they seem unusually sick even at a lower temperature.
Beyond the number on the thermometer, pay attention to how your child is acting. A toddler with a 102°F fever who is still playing and drinking fluids is generally less concerning than a child with a 100.5°F fever who is limp, unresponsive, or refusing all liquids. Behavior tells you more than the thermometer alone.
Call right away if your toddler:
- Is unusually sluggish, difficult to wake, or inconsolable
- Has trouble breathing or is breathing rapidly
- Shows signs of dehydration that aren’t improving with fluids
- Develops a rash, stiff neck, or severe headache alongside the fever
- Has a fever that keeps returning over several days
If Your Toddler Has a Seizure
Febrile seizures happen in about 3 to 4 out of every 100 children, typically between ages 6 months and 5 years. They’re triggered by a rapid rise in body temperature and, while terrifying to witness, are almost always harmless. Most last less than one to two minutes.
If it happens, place your child on the floor or a bed away from hard or sharp objects. Turn their head to the side so saliva or vomit can drain. Do not put anything in their mouth. They will not swallow their tongue. Time the seizure if you can. If it lasts longer than five minutes, call 911 immediately, as prolonged seizures need medical treatment. After a short seizure ends on its own, call your pediatrician to let them know what happened.
Febrile seizures do not cause brain damage and do not mean your child has epilepsy. Most children who have one never have another.