Sometimes children develop fevers. Here are some things for you to know.
What is a fever?
Fever is a rise above the average body temperature of 37.5°C (98.6°F). Fever is a symptom, not a disease, usually caused by an infection or a normal vaccine reaction.
Not all fevers are dangerous. A child with a mild infection can have a high temperature, while a child with a severe infection might have no fever. Higher temperatures do not mean an illness is more serious; how your child looks, and acts is a more important measure of an illness.
Types of thermometers to use:
Digital thermometers are the most accurate. These can be used in the bum (rectally), in the mouth (orally), or in the armpit.
If you find using a thermometer in the bum or mouth to be difficult, ask your health care provider if you may use:
- A thermometer for the forehead (temporal artery thermometer) if your child is at least three months old.
- A thermometer for the ear (tympanic thermometer) if your child is older than six months. This method only works if you use the device exactly as directed.
Plastic strip thermometers, pacifier thermometers, glass thermometers, or smartphone temperature apps are not reliable methods to take a child’s temperature.
How do I take my child’s temperature?
Here are some tips to remember for any method you use:
- Avoid taking your child’s temperature right after a bath as this can affect the reading.
- Stay with your child while taking a temperature.
- Mercury glass thermometers are dangerous for your child if the glass breaks.
- Be sure to read the package instructions for your thermometer.
- Follow the cleaning instructions on the package before and after use.
How to take a temperature in the bum (birth to four years) (click to expand) »
Remove the thermometer and read the temperature.
How to take a temperature in the armpit (all ages) (click to expand) »
The armpit is not as accurate as a rectal temperature. If this method does not show a fever, but your child feels warm and unwell, take a rectal measurement.
How to take a temperature in the ear (three years and up) (click to expand) »
The ear method is not as accurate as the rectal method. It is quick but can give temperature readings that are too low, even when following the manufacturer’s directions.
How to take a temperature by mouth (five years and up) (click to expand) »
Taking an oral temperature is easier in an older, cooperative child.
What is a normal temperature?
|Method||Normal temperature range|
|Rectum||36.6°C to 38°C
(97.9°F to 100.4°F)
|Armpit||36.5°C to 37.5°C
(97.8°F to 99.5°F)
|Ear||35.8°C to 38°C
(96.4°F to 100.4°F)
|Mouth||36°C to 37.5°C
(97.2°F to 98.6°F)
What do I do if my child has a high temperature (fever)?
Call your healthcare provider immediately if your child:
- is under three months of age.
- appears to be and acts very ill; or
- has a rash, cough, or wheeze with the fever.
Call your healthcare provider within 24 hours if your child is:
- is between three and six months of age.
Call your healthcare provider if:
- the fever has lasted over 24 hours with no obvious cause.
- the fever lasts more than three days.
- the fever returns within 24 hours of relief; or
- you are concerned.
What can I do to help my child feel better?
- Offer lots of fluids to drink. Call 811 if your child does not drink fluids for more than a few hours.
- Encourage rest, as much as they want. Your child can go back to school or do other activities when their temperature has been in the normal range for more than 24 hours.
- A sponge bath with warm water may help.
- It is dangerous for a child to use rubbing alcohol on their skin or in the bath.
- Medicines, such as acetaminophen (like Tylenol) or ibuprofen (like Advil or Motrin), can help. But these medicines are not always necessary. For example, a child older than three months who has a temperature of less than 38.9ºC (102ºF) and is otherwise healthy and active does not need treatment.
- It is dangerous to give aspirin to a child under 18 years old. Aspirin can cause a dangerous condition called Reye syndrome.
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