How it's done

• Rectal temperature. Turn on the digital thermometer and lubricate the tip of the thermometer with petroleum jelly. Lay your baby or child on his or her back, lift his or her thighs, and insert the lubricated thermometer 1/2 to 1 inch (1.3 to 2.5 centimeters) into the rectum. Alternatively, you can place your child on his or her belly on your lap or other firm surface. If you put your child belly down, put your hand against his or her lower back to hold the child in place.

  Never try to force a rectal thermometer past any resistance. Hold the thermometer in place until the thermometer signals that it's done. Remove the thermometer and read the number.

• Oral temperature. Turn on the digital thermometer. Place the tip of the thermometer under your child's tongue toward the back of the mouth and ask your child to keep his or her lips closed. Remove the thermometer when it signals that it's done and read the number. If your child has been eating or drinking, wait 15 minutes to take his or her temperature by mouth.
• Armpit temperature. Turn on the digital thermometer. When you place the thermometer under your child's armpit, make sure it touches skin — not clothing. While the device reads your child's temperature, hug your child, keeping the side holding the thermometer against your chest. Keep the thermometer tightly in place until the thermometer signals that it's done. Remove the thermometer and read the number.
• Ear temperature. Turn on the thermometer. Gently place the thermometer in your child's ear. Follow the directions that come with the thermometer to ensure you insert the thermometer the proper distance into the ear canal. Hold the thermometer tightly in place until the thermometer signals that it's done. Remove the thermometer and read the number.
• Temporal artery temperature. Turn on the thermometer. Gently sweep the thermometer across your child's forehead. Remove the thermometer and read the number.

When reporting a temperature to your child's doctor, give the reading and explain how the temperature was taken.