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Fever: First aid

Rectal temperature (for infants)

  • Turn on the digital thermometer and dab petroleum jelly or another lubricant on the tip of the thermometer.
  • Lay the child on his or her stomach or side, with knees flexed.
  • Carefully insert the tip 1/2 to 1 inch (1.3 to 2.5 centimeters) into the rectum.
  • Hold the thermometer and the child still until the thermometer beeps, which means it's done. To avoid injury, don't let go of the thermometer while it's inside the child.
  • Remove the thermometer and read the number.