(HealthDay News) -- If you think your child might have a fever, it's important to take the child's temperature correctly.

The Mayo Clinic offers these guidelines:

  • From birth to 3 months of age, you'll get the most accurate reading using a digital thermometer and taking the temperature rectally.
  • From 3 months to 4 years old, a digital thermometer used rectally or under the armpit is preferred.
  • Wait until your child is at least 6 months old to use a digital ear thermometer.
  • Starting at age 4, your child can probably hold a thermometer under the tongue. Other options include a temporal artery thermometer, a digital ear thermometer or a digital thermometer placed under the armpit.