An armpit (axillary) temperature is taken by holding the thermometer under your baby's arm. To give a correct reading, this must be done with care. Armpit temperatures are a good screening for a child of any age. But they're not the most accurate way to take your child's temperature. Use the steps on this handout as a guide.
Getting the thermometer ready
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Be sure to use a thermometer that's for armpit use.
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Clean the thermometer before and after each use.
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Make sure the thermometer is at room temperature.
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Remove the cover from the thermometer.
Positioning your baby
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Hold your baby on your lap. Or lay your infant on their back on a firm surface.
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Grasp your baby's elbow. Gently but firmly lift the arm away from baby's side.
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Place the tip of the thermometer in the fold of the armpit. To get a true reading, make sure the thermometer is against your baby's skin on all sides.
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Bring the arm down next to the baby's side.
Taking the temperature
Follow the instructions for using your digital thermometer.
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Keep your baby's arm against their side. This keeps the thermometer in place.
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When the thermometer beeps, release your hold and gently lift your baby's arm. Remove the thermometer.
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Read the temperature on the digital display. Normal temperature is around 98.6°F (37°C). But it can range from 97.6°F to 99.6°F (36.4°C to 37.6°C). Armpit temperatures can range from 0.5°F to 1°F (0.3°C to 0.6°C) lower than a rectal temperature.
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Before putting the thermometer away, clean it with soap and warm water or alcohol.
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When reporting the temperature to your baby's healthcare provider, tell them that it was an axillary temperature reading.
Online Medical Reviewer: Amy Finke RN BSN
Online Medical Reviewer: Heather M Trevino BSN RNC
Online Medical Reviewer: Liora C Adler MD
Date Last Reviewed: 06/01/2022
© 2000-2025 The StayWell Company, LLC. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.
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