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We've been providing trusted health information for 30 years. 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A fever means that the body’s temperature is 100.4°F (38°C) or higher. Because temperatures can be taken in different places in the body, the reading, or number, that means “fever” can be a little different depending on where you [measure](https://kidshealth.org/en/parents/take-temperature.html) it. It's a fever when a child's temperature is at or above one of these readings: - **100\.4°F (38°C):** [rectal](https://kidshealth.org/en/parents/rectal-temperature.html) (in the bottom), tympanic (in the ear), or temporal artery (across the forehead) - **100°F (37.8°C):** [oral](https://kidshealth.org/en/parents/oral-temperature.html) (in the mouth) - **99°F (37.2°C):** [axillary](https://kidshealth.org/en/parents/axillary-temperature.html) (under the arm) Fevers in kids are usually caused by an infection. A fever helps the body’s [immune system](https://kidshealth.org/en/parents/immune.html) kick into action and fight the infection.  ### Top Things to Know - A fever is usually a temperature of 100.4°F (38°C) or higher, depending on how it's measured. - Most fevers are caused by infections and help the body fight off germs. - Symptoms may include warmth, crankiness, chills, headache, and flushed skin. - Keep kids comfortable with light clothing, rest, and plenty of fluids. ## Signs & Symptoms ### What Are the Signs and Symptoms of a Fever? Here are fever symptoms to watch for in kids: - **feeling warm** - **acting differently** (they might be fussy or cranky, or quieter than usual) - **breathing a little faster** or having a **faster heart rate** than normal - having a headache - having **chills or sweating** - having **red or flushed skin** For any of these signs, take your child’s temperature to know if it’s really a fever. ### When to Go to the Emergency Room or Call the Doctor #### Go to the ER if your child has a fever and: - is **crying nonstop** or is extremely **cranky** or fussy - is **sluggish** and hard to wake up - has **purple spots** that look like bruises - has **blue lips, tongue, or nails** - has a **bulging or sunken soft spot** on the head (in babies) - has a **stiff neck**, severe headache, or bad **belly pain** - is **limp** or refuses to move - has **trouble breathing** that doesn’t get better when the nose is cleared - has a [seizure](https://kidshealth.org/en/parents/seizure.html) #### Call your doctor right away if your child: - is younger than 3 months old with a temperature of 100.4°F (38°C) or higher. **If you can’t reach your doctor,** [go to the emergency room (ER)](https://kidshealth.org/en/parents/emergency-room.html). - is any age but has a health problem like [cancer](https://kidshealth.org/en/parents/cancer.html) or [sickle cell disease](https://kidshealth.org/en/parents/sickle-cell-anemia.html) and has a fever If your child has an ongoing health issue, make sure you know when the doctor should be called for fever. #### Call your doctor if your child is 3 months or older, has a fever, and: - **doesn’t want to drink** or seems too sick to drink enough - has lasting [diarrhea](https://kidshealth.org/en/parents/diarrhea-sheet.html) or repeated [vomiting](https://kidshealth.org/en/parents/vomiting-sheet.html) - seems [dehydrated](https://kidshealth.org/en/parents/dehydration.html), like urinating (peeing) less, not having tears when crying, or being less alert and less active - has a specific complaint, like a sore throat, an earache, or pain with peeing - has a **rash** - the **fever last longer than 2–3 days** - fever keeps going above **104°F (40°C)** - **looks really sick** to you or seems to be getting worse ### When Is a Fever Probably Not Serious? A fever is likely not serious if your child is 3 months or older and: - is still interested in playing - is drinking well - is alert and smiling - has normal skin color - looks well when the temperature comes down It’s normal for kids with a fever to eat less. This is common with infections that cause fever. As long as your child is drinking and peeing normally, not eating as much as usual is OK. ## Causes ### What Causes a Fever? The most common cause of fever is an **infection**, but one can also be caused by: - **Overdressing.** Infants, especially newborns, may get fevers if they're overdressed, wrapped in a blanket, or in a hot environment because they don't regulate (control) their body temperature as well as older kids. But because fevers in newborns can be a sign of a serious infection, even infants who are overdressed must be checked by a doctor if they have a fever. - [Vaccines](https://kidshealth.org/en/parents/vaccine.html). Babies and kids sometimes get a mild fever that lasts about a day after getting vaccinated. - [Teething](https://kidshealth.org/en/parents/teething.html). A child who has a tooth or teeth coming in might have a slight rise in body temperature, but it's probably not the cause if the temperature is higher than 100°F (37.8°C). ## How Should I Take My Child's Temperature? If your child feels warm or is acting unwell, use a **digital thermometer** to check for a fever. Some ways of taking a temperature are more accurate than others at measuring the true body temperature. The best way to take a temperature: - **For kids 3 years old and younger:** in the bottom - **For kids 4 or older who can cooperate:** by mouth - **For any age:** The forehead and under the armpit are easiest but not always as accurate. In the ear is OK for kids 6 months and older. ## Treatment & Home Care ### How Is It Treated? When kids have a fever, no treatment is needed if they’re still playing and drinking normally, and seem comfortable. If they aren’t feeling well though, there are ways to help them feel better. #### Medicines Give medicine if your child has a fever and isn’t comfortable or can’t drink. (But don’t give any medicine to babies younger than 3 months old unless your doctor tells you to.) You can try one of these: - [acetaminophen](https://kidshealth.org/en/parents/acetaminophen.html) (like Tylenol or a store brand) or - [ibuprofen](https://kidshealth.org/en/parents/ibuprofen.html) (like Advil, Motrin, or a store brand) Do not give ibuprofen to children younger than 6 months old. **Unless your doctor tells you to, never give aspirin to a child.** Such use is linked to [Reye syndrome](https://kidshealth.org/en/parents/reye.html), a rare but serious illness. Follow the package directions for acetaminophen or ibuprofen for how much to give and how often. If you can’t determine the recommended dose, call your doctor. Also call if your child is younger than age 2 or has underlying medical conditions to find out the best medicine to give. ### How Can I Help My Child Feel Better? #### Staying Comfortable To help kids with a fever feel better, try these tips: - Have your child wear **lightweight clothing** and stay covered with a **light sheet or blanket**. Heavy clothes and blankets can keep the body from cooling, which can be uncomfortable. - Set the room at a **temperature** that’s not too hot or too cold. - Make sure they get plenty of **rest**. Staying in bed all day isn't needed, but kids should take it easy. - Keep kids home from **school or childcare** until their temperature has been normal for 24 hours without the help of medicines. #### Things to Avoid Here are some things to **avoid** when your child has a fever: - cold baths or ice packs because they can make kids shiver, which can raise body temperature - rubbing alcohol because it can cause poisoning when absorbed through the skin #### Food and Drinks Offer plenty of liquids to avoid [dehydration](https://kidshealth.org/en/parents/dehydration.html) because fevers make kids lose fluids faster than usual. **Oral rehydration solutions** (like Pedialyte, Enfalyte, or store brands) are a good choice. Babies can have more breast milk or formula than usual. Older kids can have water, soup, ice pops, and flavored gelatin. Avoid drinks with [caffeine](https://kidshealth.org/en/parents/child-caffeine.html), including colas and tea, which can worsen dehydration by making kids pee more often. Let kids eat what they want (in reasonable amounts), but don't force it if they don't feel like eating much. ## What Else Should I Know? In most cases, kids with a fever are **back to normal within a few days**. For older babies and kids, the way they act can be more important than the reading on your thermometer. It’s normal to act a little cranky with a fever. But you know your child best. If you’re not sure what to do or what a fever might mean, or if your child seems ill in a way that concerns you even with no fever, always call your doctor for advice. **Medically reviewed by:** [Larissa Hirsch, MDThis link opens in a new tab](https://www.nemours.org/about/kidshealth-medical-editors.html) Date reviewed: November 2025 ## More on this topic for: - Parents - Kids - Teens ## More on this topic For Parents - [Taking Your Child's Temperature](https://kidshealth.org/en/parents/take-temperature.html) - [What to Do About a Fever (High Temperature)](https://kidshealth.org/en/parents/fever-sheet.html) - [How to Take a Rectal Temperature](https://kidshealth.org/en/parents/rectal-temperature.html) - [How to Take an Oral Temperature](https://kidshealth.org/en/parents/oral-temperature.html) - [How to Take an Axillary (Armpit) Temperature](https://kidshealth.org/en/parents/axillary-temperature.html) - [Febrile Seizures](https://kidshealth.org/en/parents/febrile.html) ## More on this topic For Kids - [Dehydration](https://kidshealth.org/en/kids/dehydration.html) - [What's Sweat?](https://kidshealth.org/en/kids/sweat.html) - [What Are Germs?](https://kidshealth.org/en/kids/germs.html) ## More on this topic For Teens - [Flu (Topic Center)](https://kidshealth.org/en/teens/center/flu-center.html) - [Germs: Bacteria, Viruses, Fungi, and Protozoa](https://kidshealth.org/en/teens/care-about-germs.html) - [Fighting Germs](https://kidshealth.org/en/teens/fighting-germs.html) View more Share: - Share to Facebook - Share to Twitter - Share to Pinterest ## RELATED CATEGORIES - [Common Childhood Infections](https://kidshealth.org/en/parents/infections/common.html) - [Bacterial & Viral Infections](https://kidshealth.org/en/parents/infections/bacterial-viral.html) - [Your Kid's Body](https://kidshealth.org/en/parents/general/body.html) - [Aches, Pains & Injuries](https://kidshealth.org/en/parents/general/aches.html) - [Emergencies](https://kidshealth.org/en/parents/firstaid-safe/emergencies.html) /content/kidshealth/misc/medicalcodes/parents/articles/fever ##### Who We Are - [About Us](https://kidshealth.org/en/parents/about.html) ##### Working With Us - [Partners](https://kidshealth.org/en/parents/partners.html) - [Editorial Policy](https://kidshealth.org/en/parents/editorial-policy.html) - [Permissions Guidelines](https://kidshealth.org/en/parents/permissions-guidelines.html) - [Media Requests This link opens in a new tab](https://nemours.mediaroom.com/journalist-resources) - [Contact Us](https://kidshealth.org/en/parents/general-information/contact-us) ##### Legal & Privacy - [Privacy Policy & Terms of Use](https://kidshealth.org/en/parents/policy.html) - [Notice of Nondiscrimination](https://kidshealth.org/en/parents/nondiscrimination.html) ##### All Categories - [For Parents](https://kidshealth.org/en/parents/all-categories.html) - [For Kids](https://kidshealth.org/en/kids/all-categories.html) - [For Teens](https://kidshealth.org/en/teens/all-categories.html) ##### Wellness Centers - [For Parents](https://kidshealth.org/en/parents/centers/center.html) - [For Kids](https://kidshealth.org/en/kids/centers/center.html) - [For Teens](https://kidshealth.org/en/teens/centers/center.html) - [](https://www.facebook.com/nemourskidshealth/) - [](https://x.com/nemours) - [](https://www.youtube.com/@NemoursKidsHealth) [](https://www.nemours.org/?external_id=RE2350803010600) Note: All information on Nemours KidsHealth® is for educational purposes only. 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## Overview ### What Is a Fever? A fever means that the body’s temperature is 100.4°F (38°C) or higher. Because temperatures can be taken in different places in the body, the reading, or number, that means “fever” can be a little different depending on where you [measure](https://kidshealth.org/en/parents/take-temperature.html) it. It's a fever when a child's temperature is at or above one of these readings: - **100\.4°F (38°C):** [rectal](https://kidshealth.org/en/parents/rectal-temperature.html) (in the bottom), tympanic (in the ear), or temporal artery (across the forehead) - **100°F (37.8°C):** [oral](https://kidshealth.org/en/parents/oral-temperature.html) (in the mouth) - **99°F (37.2°C):** [axillary](https://kidshealth.org/en/parents/axillary-temperature.html) (under the arm) Fevers in kids are usually caused by an infection. A fever helps the body’s [immune system](https://kidshealth.org/en/parents/immune.html) kick into action and fight the infection.  ### Top Things to Know - A fever is usually a temperature of 100.4°F (38°C) or higher, depending on how it's measured. - Most fevers are caused by infections and help the body fight off germs. - Symptoms may include warmth, crankiness, chills, headache, and flushed skin. - Keep kids comfortable with light clothing, rest, and plenty of fluids. ## Signs & Symptoms ### What Are the Signs and Symptoms of a Fever? Here are fever symptoms to watch for in kids: - **feeling warm** - **acting differently** (they might be fussy or cranky, or quieter than usual) - **breathing a little faster** or having a **faster heart rate** than normal - having a headache - having **chills or sweating** - having **red or flushed skin** For any of these signs, take your child’s temperature to know if it’s really a fever. ### When to Go to the Emergency Room or Call the Doctor #### Go to the ER if your child has a fever and: - is **crying nonstop** or is extremely **cranky** or fussy - is **sluggish** and hard to wake up - has **purple spots** that look like bruises - has **blue lips, tongue, or nails** - has a **bulging or sunken soft spot** on the head (in babies) - has a **stiff neck**, severe headache, or bad **belly pain** - is **limp** or refuses to move - has **trouble breathing** that doesn’t get better when the nose is cleared - has a [seizure](https://kidshealth.org/en/parents/seizure.html) #### Call your doctor right away if your child: - is younger than 3 months old with a temperature of 100.4°F (38°C) or higher. **If you can’t reach your doctor,** [go to the emergency room (ER)](https://kidshealth.org/en/parents/emergency-room.html). - is any age but has a health problem like [cancer](https://kidshealth.org/en/parents/cancer.html) or [sickle cell disease](https://kidshealth.org/en/parents/sickle-cell-anemia.html) and has a fever If your child has an ongoing health issue, make sure you know when the doctor should be called for fever. #### Call your doctor if your child is 3 months or older, has a fever, and: - **doesn’t want to drink** or seems too sick to drink enough - has lasting [diarrhea](https://kidshealth.org/en/parents/diarrhea-sheet.html) or repeated [vomiting](https://kidshealth.org/en/parents/vomiting-sheet.html) - seems [dehydrated](https://kidshealth.org/en/parents/dehydration.html), like urinating (peeing) less, not having tears when crying, or being less alert and less active - has a specific complaint, like a sore throat, an earache, or pain with peeing - has a **rash** - the **fever last longer than 2–3 days** - fever keeps going above **104°F (40°C)** - **looks really sick** to you or seems to be getting worse ### When Is a Fever Probably Not Serious? A fever is likely not serious if your child is 3 months or older and: - is still interested in playing - is drinking well - is alert and smiling - has normal skin color - looks well when the temperature comes down It’s normal for kids with a fever to eat less. This is common with infections that cause fever. As long as your child is drinking and peeing normally, not eating as much as usual is OK. ## Causes ### What Causes a Fever? The most common cause of fever is an **infection**, but one can also be caused by: - **Overdressing.** Infants, especially newborns, may get fevers if they're overdressed, wrapped in a blanket, or in a hot environment because they don't regulate (control) their body temperature as well as older kids. But because fevers in newborns can be a sign of a serious infection, even infants who are overdressed must be checked by a doctor if they have a fever. - [Vaccines](https://kidshealth.org/en/parents/vaccine.html). Babies and kids sometimes get a mild fever that lasts about a day after getting vaccinated. - [Teething](https://kidshealth.org/en/parents/teething.html). A child who has a tooth or teeth coming in might have a slight rise in body temperature, but it's probably not the cause if the temperature is higher than 100°F (37.8°C). ## How Should I Take My Child's Temperature? If your child feels warm or is acting unwell, use a **digital thermometer** to check for a fever. Some ways of taking a temperature are more accurate than others at measuring the true body temperature. The best way to take a temperature: - **For kids 3 years old and younger:** in the bottom - **For kids 4 or older who can cooperate:** by mouth - **For any age:** The forehead and under the armpit are easiest but not always as accurate. In the ear is OK for kids 6 months and older. ## Treatment & Home Care ### How Is It Treated? When kids have a fever, no treatment is needed if they’re still playing and drinking normally, and seem comfortable. If they aren’t feeling well though, there are ways to help them feel better. #### Medicines Give medicine if your child has a fever and isn’t comfortable or can’t drink. (But don’t give any medicine to babies younger than 3 months old unless your doctor tells you to.) You can try one of these: - [acetaminophen](https://kidshealth.org/en/parents/acetaminophen.html) (like Tylenol or a store brand) or - [ibuprofen](https://kidshealth.org/en/parents/ibuprofen.html) (like Advil, Motrin, or a store brand) Do not give ibuprofen to children younger than 6 months old. **Unless your doctor tells you to, never give aspirin to a child.** Such use is linked to [Reye syndrome](https://kidshealth.org/en/parents/reye.html), a rare but serious illness. Follow the package directions for acetaminophen or ibuprofen for how much to give and how often. If you can’t determine the recommended dose, call your doctor. Also call if your child is younger than age 2 or has underlying medical conditions to find out the best medicine to give. ### How Can I Help My Child Feel Better? #### Staying Comfortable To help kids with a fever feel better, try these tips: - Have your child wear **lightweight clothing** and stay covered with a **light sheet or blanket**. Heavy clothes and blankets can keep the body from cooling, which can be uncomfortable. - Set the room at a **temperature** that’s not too hot or too cold. - Make sure they get plenty of **rest**. Staying in bed all day isn't needed, but kids should take it easy. - Keep kids home from **school or childcare** until their temperature has been normal for 24 hours without the help of medicines. #### Things to Avoid Here are some things to **avoid** when your child has a fever: - cold baths or ice packs because they can make kids shiver, which can raise body temperature - rubbing alcohol because it can cause poisoning when absorbed through the skin #### Food and Drinks Offer plenty of liquids to avoid [dehydration](https://kidshealth.org/en/parents/dehydration.html) because fevers make kids lose fluids faster than usual. **Oral rehydration solutions** (like Pedialyte, Enfalyte, or store brands) are a good choice. Babies can have more breast milk or formula than usual. Older kids can have water, soup, ice pops, and flavored gelatin. Avoid drinks with [caffeine](https://kidshealth.org/en/parents/child-caffeine.html), including colas and tea, which can worsen dehydration by making kids pee more often. Let kids eat what they want (in reasonable amounts), but don't force it if they don't feel like eating much. ## What Else Should I Know? In most cases, kids with a fever are **back to normal within a few days**. For older babies and kids, the way they act can be more important than the reading on your thermometer. It’s normal to act a little cranky with a fever. But you know your child best. If you’re not sure what to do or what a fever might mean, or if your child seems ill in a way that concerns you even with no fever, always call your doctor for advice. Date reviewed: November 2025