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A fever is a natural reaction of the body to an illness, such as infections due to a virus or bacteria. In most cases, the fever itself is not harmful. It actually helps the body fight infections. A fever does not need to be treated unless your child is uncomfortable and looks or acts sick. How your child looks and feels are often more important than the level of the fever.
If your child has a fever, check his or her temperature as needed. Do not use a glass thermometer that contains mercury. They can be dangerous if the glass breaks and the mercury spills out. A digital thermometer is a good alternative. The way you use it will depend on your child's age. Ask your child’s doctor for more information about how to use a thermometer on your child. General guidelines are:
The American Academy of Pediatrics recommends that, for safety, temperatures of babies 90 days old and younger be first measured under the armpit. However, if the armpit temperature is above 99°F (37.2°C) a rectal temperature must also be taken. Rectal temperatures are more accurate. Since infants must be immediately evaluated by a doctor if they have a fever, accuracy is very important.
For toddlers, take an axillary temperature (under the armpit).
For children old enough to hold a thermometer in the mouth (usually around 5 years of age), take an oral temperature (in the mouth).
For children 6 months and older, you can use an ear thermometer, also called a tympanic membrane thermometer.
For infants and children, you can use a temporal artery thermometer.
If your child has a fever, here are some things you can do to help him or her feel better:
Give fluids to replace those lost through sweating with fever. You can give water, broths or soups, diluted fruit juice, or frozen juice bars. For an infant, breast milk or formula is fine.
If your child has discomfort from the fever, check with your health care provider to see if you can use ibuprofen or acetaminophen to help reduce the fever. (Never give aspirin to a child under age 18. It could cause a rare but serious condition called Reye’s syndrome.) Generally, ibuprofen is not recommended for infants younger than 6 months. The correct dose for these medications depends on your child's weight.
Make sure your child gets lots of rest.
Dress your child lightly and change clothes often if he or she sweats a lot. Use only enough covers on the bed for your child to be comfortable.
Exercise, eating, excitement, and hot or cold drinks can all affect your child’s temperature.
A child’s reaction to fever can vary. Your child may feel fine with a high fever, or feel miserable with a slight fever.
If your child is active and alert, and is eating and drinking, there is no need to give fever medication.
Temperatures are naturally lower in the morning (4 to 8 a.m.) and higher in the early evening (4 to 6 p.m.).
Call the doctor’s office if your otherwise healthy child has any of the signs or symptoms described below:
A rectal temperature of 100.4°F (38.0°C) or higher in an infant younger than 3 months
A rectal temperature of 102°F (39.0°C) or higher in a child 3 to 36 months old
A temperature of 103°F (39.4°C) or higher in a child of any age
A fever that lasts more than 24 hours in a child younger than 2 years or for 3 days in a child 2 years or older
A seizure caused by the fever
Rapid breathing or shortness of breath
A stiff neck or headache
Persistent brown, green, or bloody mucus
Signs of dehydration, which include severe thirst, dark yellow urine, infrequent urination, dull or sunken eyes, dry skin, and dry or cracked lips
Your child still doesn’t look right to you, even after taking a nonaspirin pain reliever