Accurate Newborn Armpit Temperature Measurement Guide (2025)

June 3, 2025

8 min read

Newborn armpit temperature measurement is a crucial aspect of monitoring a newborn's health. As a parent or caregiver, it's essential to understand the proper techniques for taking an accurate armpit temperature reading. In this guide, we'll walk you through the steps and provide valuable insights from a pediatric expert.

Why Armpit Temperature Measurement is Important

Armpit temperature measurement, also known as axillary temperature measurement, is a non-invasive and easy way to monitor a newborn’s temperature. It’s particularly useful for newborns, as it’s less stressful and invasive compared to other methods, such as rectal temperature measurement.

Preparation is Key

Before taking a newborn’s armpit temperature, ensure you have the following:

• A digital thermometer specifically designed for newborns
• A clean and dry armpit area
• A comfortable and secure environment for the newborn

As a pediatric expert with over a decade of experience, I recommend using a digital thermometer with a soft and flexible probe. This type of thermometer is designed for newborns and provides accurate readings.

Step-by-Step Guide to Taking an Armpit Temperature

Follow these steps to take an accurate armpit temperature reading:

1. Prepare the Thermometer: Turn on the digital thermometer and ensure it’s set to the correct mode (armpit or axillary).
2. Gently lift the Arm: Carefully lift the newborn’s arm and place the thermometer probe in the armpit.
3. Position the Thermometer: Ensure the probe is centered and the thermometer is snugly positioned in the armpit.
4. Hold the Arm in Place: Gently hold the arm in place to maintain the thermometer’s position.
5. Wait for the Reading: Wait for the thermometer to beep or display the temperature reading.

Interpreting the Results

Normal armpit temperature ranges for newborns are:

If the temperature reading is:

• Below 36.5°C (97.7°F), it may indicate hypothermia.
• Above 37.8°C (100.0°F), it may indicate fever.

💡 As a pediatric expert, I recommend consulting a healthcare professional if the newborn's temperature reading is outside the normal range or if there are concerns about their overall health.

Tips and Precautions

When taking a newborn's armpit temperature, keep the following tips and precautions in mind:

• Avoid using glass thermometers, as they can be hazardous and are not recommended for newborns.
• Don’t use ear thermometers, as they may not provide accurate readings for newborns.
• Ensure the thermometer is clean and disinfected between uses.

Common Challenges and Solutions

Some common challenges when taking a newborn’s armpit temperature include:

• Newborn movement: Try to take the temperature when the newborn is calm and still.
• Incorrect thermometer positioning: Ensure the thermometer is centered and snugly positioned in the armpit.

In conclusion, taking an accurate armpit temperature reading is a crucial aspect of monitoring a newborn’s health. By following the steps outlined in this guide and being aware of the common challenges and solutions, you can ensure accurate readings and provide the best possible care for your newborn.