Knowing how to check body temperature of an infant at home is important when a baby feels unusually warm, appears unwell, or has other signs of illness. A digital thermometer is the preferred option for home temperature checks. For infants, rectal temperature can provide the most accurate measurement, but parents and caregivers should follow their healthcare provider’s guidance and the thermometer manufacturer’s instructions.
Choose a Suitable Thermometer
Use a digital thermometer that is designed for the method you intend to use. Avoid using mercury thermometers because they can break and expose the baby to mercury.
Use a digital thermometer
Check that it is clean and functioning
Follow the manufacturer’s instructions
Prepare the Baby
Keep the infant calm and avoid checking immediately after a bath, heavy wrapping, or vigorous crying if possible. Wait a few minutes and allow the baby to settle.
Keep the baby comfortable
Remove excessive clothing or blankets
Let the baby settle before measuring
Choose the Measurement Method
For young infants, a rectal temperature is generally considered the most accurate way to measure temperature. An underarm measurement can also be used, but it may be less accurate.
Do not use an oral thermometer for a young infant. Ear thermometers may not be suitable for very young babies unless the manufacturer specifically states that they can be used at that age.
Follow the recommended method for the baby’s age
Use an underarm method if advised
Ask a healthcare professional if you are unsure
Take a Rectal Temperature Safely
If you have been advised to take a rectal temperature, use a digital thermometer specifically suitable for rectal use.
Place a small amount of appropriate lubricant on the thermometer tip and gently insert it only as far as recommended by the manufacturer or your healthcare professional. Never force the thermometer, and never leave the baby unattended while taking the measurement.
Wash your hands
Use the correct thermometer
Lubricate the tip if required
Keep the baby secure
Never force the thermometer
Take an Underarm Temperature
If you are using the underarm method, place the thermometer tip high in the baby’s armpit against bare skin.
Hold the baby’s arm gently against the body until the thermometer signals that the measurement is complete.
Place the thermometer against bare skin
Keep the baby’s arm close to the body
Wait for the thermometer to finish
Record the Temperature
Write down the temperature, time, and method used.
Keeping a record can help you notice whether the baby’s temperature is changing and provides useful information if you need to speak to a healthcare professional.
Record the temperature
Note the time
Record how the temperature was taken
Know When to Seek Medical Care
For babies younger than three months, a rectal temperature of 38°C (100.4°F) or higher is generally considered a fever and requires prompt medical assessment, even if the baby otherwise appears well.
Seek urgent medical attention if the infant has difficulty breathing, is unusually sleepy or difficult to wake, has a seizure, develops a concerning rash, is not feeding well, shows signs of dehydration, or appears seriously unwell.
