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Baby's Temperature

If you are concerned that your baby may be running a fever, you may take your baby's temperature with a digital thermometer. In the early newborn period, it is preferable to take the baby's temperature under the arm. There are different ways to take your baby's temperature. Each is listed below, with directions:

  • Under the arm (auxillary): This is the easiest and best way to take your baby's temperature for the first few weeks. Just put the end of the digital thermometer under the baby's armpit until the temperature registers. Call your baby's doctor if his or her temperature is 100 degrees Fahrenheit or 38 degrees Celsius or higher.
  • Rectally: Lie your baby on his/her back, lift your baby's legs up and gently but firmly hold them, or place baby on his/her tummy and separate the buttocks. Insert the thermometer gently into the rectum. Only insert the metal tip. You may use some lubricant (like water or water-soluble jelly) on the tip. Hold the thermometer between your fingers with your hand flat across the baby's bottom. Do not let go of the thermometer. Hold the thermometer in place until it beeps. Gently pull it out and read it. Call your baby's doctor if your baby's temperature is 100.4 degrees Fahrenheit or 38 degrees Celsius or higher.
  • Orally: This is not recommended until your baby is much older.

Types of Thermometers

  • Digital Thermometer: Most recommended for taking babies' temperatures. Read the number when the thermometer beeps that it is done (Check the manufacturer's directions for the digital thermometer you are using).
  • Glass Thermometer: Do not use unless it is all you have. This thermometer must be held under the arm or in the rectum for 4-5 minutes to get an accurate temperature.
  • Ear Thermometer: An ear thermometer is generally not used during the newborn period. Check with your health care provider if you have a question about this type of thermometer.

Clean your thermometer in warm (not hot) water with soap and water and rub with rubbing alcohol. Store in case/container to avoid breaking your thermometer.