Fever: Brief Version
What is a fever?
A fever means the body temperature is above normal. Your child has a fever if:
- The rectal temperature is over 100.4° F (38° C).
- The temperature taken by mouth is over 100° F (37.8° C).
- The armpit temperature is over 99.0° F (37.2° C).
- The ear temperature is over 100.4° F (38° C).
- The pacifier temperature is over 100° F (37.8° C).
Fever helps fight infections. Most fevers are not harmful. They may last 2 or 3 days.
How can I take care of my child?
- Use medicine only if the child needs it. Remember that fever helps your child fight the infection. Use medicine only if the fever is over 102° F (39° C) and your child is uncomfortable.
- You can give acetaminophen (Tylenol) to children older than 3 months. Fever medicine lowers the fever by 2 to 3° F (1 to 1.5° C).
- You may want to give your child ibuprofen instead. Ibuprofen (Advil) works 2 hours longer than acetaminophen. Give the right dose for your child's weight, every 6 to 8 hours, as needed. You can give ibuprofen to children over 6 months of age.
- Do not give your child or teen aspirin.
- Sponge your child if the fever does not go down. Sponge your child if your child's temperature stays over 104° F (40° C) 30 minutes after your child has taken acetaminophen or ibuprofen. Always give your child acetaminophen or ibuprofen first. Sit your child in only 2 inches of lukewarm water. Sponge off the child's skin. If your child shivers, stop sponging or put in more warm water.
- Have your child drink a lot of cold fluids.
- Have your child wear as little clothing as possible. Do not bundle up your child. It may make the fever go higher.
For fevers of 100 to 102° F (37.8 to 38.9° C), cold fluids and little clothing may be all your child needs. Your child may not need acetaminophen.
Call your child's doctor right away if:
- Your child is less than 3 months old.
- Your child's fever is over 104° F (40° C).
- Your child has a seizure.
- Your child looks or acts very sick.
Call your child's doctor within 24 hours if:
- Your child is 3 to 6 months old (unless the fever is due to an immunization shot).
- Your child has had a fever more than 24 hours and you don't know what is causing it AND your child is less than 2 years old.
- Your child has had a fever for more than 3 days.
- The fever went away for over 24 hours and then came back.
- You have other concerns or questions.
Written by B.D. Schmitt, MD, author of "Your Child's Health," Bantam Books.
Published by RelayHealth.
Last modified: 2009-08-13
Last reviewed: 2010-06-02
This content is reviewed periodically and is subject to change as new health information becomes
available. The information is intended to inform and educate and is not a replacement for medical
evaluation, advice, diagnosis or treatment by a health care professional.