A fever is a natural reaction of the body to an illness. A child’s fever usually isn’t harmful. It helps the body fight infections. A fever often doesn’t need to be treated. But it does need to be treated if your child is uncomfortable and looks and acts sick. Fever needs to be treated in a child who has a long-term (chronic) health condition or has had febrile seizures in the past.
Home care
Keep your child dressed in lightweight clothing. This is to help your child's body release excess heat. The fever will go up if you dress your child in extra layers or wrap your child in blankets.
Fever causes the body to lose water. For infants younger than 1 year old, keep giving regular formula or breastfeeding. Between feedings, give oral rehydration solution. You can get this at the grocery store or pharmacy without a prescription. For children 1 year or older, give plenty of fluids. Good fluids include water, diluted fruit juice, gelatin water, electrolyte drinks, soft drinks with no caffeine, ginger ale, lemonade, and frozen fruit pops.
Fever medicines
Watch how your child is acting and feeling. You don’t need to give fever medicine if your child is active and alert, and is eating and drinking. You may need to give fever medicine if your child has a long-term (chronic) health condition or has had febrile seizures in the past. Talk with your child’s health care provider about when to treat your child’s fever.
You may give acetaminophen or ibuprofen if your child:
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Becomes less active
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Looks and acts sick
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Isn’t sleeping, drinking, or eating as usual
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Has a temperature of 100.4°F (38°C) or higher
Use the dose advised by your child’s health care provider or the dose listed on the medicine bottle label for your child’s age and weight. If your child has chronic liver or kidney disease or ever had a stomach ulcer or gastrointestinal bleeding, talk with the provider before giving your child these medicines.
If your child can’t take or keep down oral medicine, ask the pharmacist or provider about fever medicines that can be given as a rectal suppository. You can get these without a prescription.
Ask your child’s provider if you should wake your child to give fever medicine. Sleep is important to help your child get better.
When giving fever medicine to a child with no chronic illness:
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Don’t give ibuprofen to a child younger than 6 months old.
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Read the label before giving fever medicine. This is to make sure that you're giving the right dose for your child’s age and weight.
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If your child is taking other medicines, check the list of ingredients. Look for acetaminophen or ibuprofen. If so, ask your child’s provider before giving your child the medicine. This is to prevent a possible overdose.
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If your child is younger than 2 years, talk with the provider before giving any medicines. They will tell you the right medicine to use and how much to give.
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Don’t give aspirin to a child younger than 15 years old who has a fever. Aspirin can cause serious side effects, such as brain and liver damage related to a condition called Reye syndrome.
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Don’t give ibuprofen if your child is vomiting a lot and is dehydrated.
After the fever is under control, keep giving your child either acetaminophen or ibuprofen. Give the medicine that works best. If either medicine alone doesn’t keep the fever down, contact your child’s provider.
Fever and children
Use a digital thermometer to check your child’s temperature. Don’t use a mercury thermometer. There are different kinds and uses of digital thermometers. They include:
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Rectal. For children younger than 3 years, a rectal temperature is the most accurate.
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Forehead (temporal). This works for children ages 3 months and older. If a child younger than age 3 months has signs of illness, this can be used for a first pass. The health care provider may want to confirm with a rectal temperature.
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Ear (tympanic). Ear temperatures are accurate after 6 months of age, but not before.
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Armpit (axillary). This is the least reliable but may be used for a first pass to check a child of any age with signs of illness. The provider may want to confirm with a rectal temperature.
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Mouth (oral). Don’t use a thermometer in your child’s mouth until they're at least 4 years old.
Use the rectal thermometer with care. Follow the product maker’s directions for correct use. Insert it gently. Label it and make sure it’s not used in the mouth. It may pass on germs from the stool. If you don’t feel okay using a rectal thermometer, ask the provider what type to use instead. When you talk with any provider about your child’s fever, tell them which type you used.
Below are guidelines to know if your young child has a fever. Your child’s provider may give you different numbers for your child. Follow your provider’s specific instructions.
Fever readings for a baby under 3 months old:
Fever readings for a child age 3 months to 36 months (3 years):
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Rectal, forehead, or ear: 102°F (38.9°C) or higher
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Armpit: 101°F (38.3°C) or higher
Contact the health care provider in these cases:
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Repeated temperature of 104°F (40°C) or higher in a child of any age
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Fever of 100.4° F (38° C) or higher in baby younger than 3 months
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Fever that lasts more than 24 hours in a child under age 2
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Fever that lasts for 3 days in a child age 2 or older