How to Take a Baby's Underarm Temperature

Although rectal temperature readings are the most accurate, many parents prefer to take their infant's underarm temperature. This process is simple and can be performed while the baby is sleeping without waking him. All you need is a regular digital thermometer.

Things You'll Need

• Digital thermometer

Instructions

1. Remove the protective cap from the end of the thermometer.

2. Warm the tip of the thermometer in your hand so that it isn't cold and won't startle the baby.

3. Lift your infant's arm and place the thermometer right into his armpit, holding it firmly in place.

4. Turn the thermometer on and lower your baby's arm gently down so that the thermometer is completely covered.

5. Wait until the thermometer beeps or flashes for an accurate reading of the baby's temperature.

Tips & Warnings

• Underarm temperature readings can be up to two degrees less than rectal temperature readings.

• A fever in a baby under three months of age can be dangerous, so a rectal thermometer is recommended for a more accurate measurement.

References

• FamilyDoctor.org: Fever in Infants and Children
• Baby Center: How to Take your Baby's Temperature; April 2007