At age 2, you have several good options for taking your child’s temperature: forehead (temporal), ear (tympanic), and armpit (axillary) thermometers all work well. There’s no single “best” method, according to the American Academy of Pediatrics. Each has trade-offs in speed, ease, and accuracy. A fever is defined as 100.4°F (38°C) or higher when measured by ear or forehead thermometer.
Which Thermometer Type Works Best
Forehead thermometers (also called temporal artery thermometers) have become the most popular choice for toddlers because they’re fast and require almost no cooperation from your child. You swipe or hold the device across the forehead, and the reading appears in seconds. Recent research supports their accuracy in children as young as 3 months, making them a reliable pick for a 2-year-old.
Ear thermometers are another solid option for any child over 6 months. They give a reading in about one second, which is helpful with a squirmy toddler. The catch is that earwax or incorrect placement can throw off the result. If your child has an ear infection or a lot of wax buildup, switch to a different method for that reading.
Armpit (axillary) thermometers are the least invasive option and use a standard digital thermometer. They’re easy to use but tend to read lower than the actual core body temperature. For armpit readings, the fever threshold is lower: 99°F (37.2°C) rather than 100.4°F. The difference between an armpit reading and a core temperature can vary by nearly a full degree Celsius in toddlers, and no simple formula reliably converts one to the other. So if an armpit reading seems borderline, consider confirming with an ear or forehead thermometer.
Oral thermometers aren’t practical at this age. Most 2-year-olds can’t hold a thermometer under their tongue long enough for an accurate reading. You can save that method for when your child is 4 or older.
How to Take an Ear Temperature
Turn the thermometer on and place a clean probe tip at the opening of your child’s ear canal. For children over 1 year old, gently pull the ear back and upward to straighten the ear canal. This is the opposite of what you’d do for an infant, where you pull straight back. Aim the tip of the probe toward the space between your child’s opposite eye and ear. Press the button and wait for the beep.
If the reading seems surprisingly low or high, try again. A poorly seated probe is the most common reason for an off result. Take two or three readings and go with the highest one.
How to Take a Forehead Temperature
For contact temporal thermometers, place the sensor flat against the center of the forehead, press the scan button, and slide it across the temple toward the hairline. Some newer models are no-contact: you hold them an inch or two from the forehead without touching the skin. Either way, make sure your child’s forehead is dry. Sweat can pull the reading down.
You can take a forehead temperature while your child is sleeping without waking them, which is a real advantage during sick nights.
How to Take an Armpit Temperature
Place the tip of a standard digital thermometer in the center of your child’s bare armpit. Fold their arm down snugly against their body and hold it there until the thermometer beeps, usually 30 to 60 seconds. The key is skin-to-skin contact with no clothing in between, and keeping the arm pressed down the entire time so air doesn’t reach the sensor.
Fever Thresholds by Method
The number that counts as a fever depends on where you measured:
- Ear or forehead: 100.4°F (38°C) or higher
- Mouth: 100°F (37.8°C) or higher
- Armpit: 99°F (37.2°C) or higher
These differences exist because each site measures a slightly different proximity to your child’s core body temperature. Rectal and ear readings run closest to the true internal temperature, while armpit readings run the lowest.
Tips for Getting a Good Reading
Take the temperature after your child has been sitting calmly for a few minutes. Running around, drinking something warm, or being bundled in blankets can all nudge the number up temporarily. If your child just had a bath, wait 15 to 20 minutes.
When your child is sick and you’re monitoring a fever, use the same thermometer and the same method each time. Switching between ear and armpit readings makes it hard to tell whether the fever is rising or falling, since the two methods naturally produce different numbers.
Keeping Your Thermometer Clean
Wipe forehead thermometers with an alcohol pad (at least 70% alcohol) between each use. Ear thermometers should get the same treatment, or you can use disposable probe covers and replace them after every reading. Standard digital thermometers used in the armpit should also be wiped with alcohol or warm soapy water before and after each use. Always let the thermometer dry before storing it.
When a Fever Needs Attention
For a 2-year-old, call your child’s doctor if the temperature repeatedly climbs above 104°F (40°C), or if a fever of any level lasts more than 3 days (72 hours). Certain symptoms alongside a fever also warrant a call: unusual drowsiness, a stiff neck, difficulty breathing, a rash you can’t explain, repeated vomiting or diarrhea, or a seizure.
The number on the thermometer matters, but how your child is acting matters more. A toddler with a 101°F fever who is playing and drinking fluids is generally less concerning than one with a 100.5°F fever who is limp and unresponsive. If your child still looks sick after the fever comes down with treatment, that’s worth a call too.