Always use a digital thermometer to check your child’s temperature. Never use a mercury
For infants and toddlers, be sure to use a rectal thermometer correctly. A rectal
thermometer may accidentally poke a hole in (perforate) the rectum. It may also pass
on germs from the stool. Always follow the product maker’s directions for proper use.
If you don’t feel comfortable taking a rectal temperature, use another method. When
you talk to your child’s healthcare provider, tell him or her which method you used
to take your child’s temperature.
Here are guidelines for fever temperature. Ear temperatures aren’t accurate before
6 months of age. Don’t take an oral temperature until your child is at least 4 years
Infant under 3 months old:
Ask your child’s healthcare provider how you should take the temperature.
Rectal or forehead (temporal artery) temperature of 100.4°F (38°C) or higher, or as
directed by the provider
Armpit temperature of 99°F (37.2°C) or higher, or as directed by the provider