T
The Daily Insight

What is considered a fever for a 3 month old?

Author

Emma Jordan

Published Mar 24, 2026

A baby’s normal temperature can range from about 97 to 100.3 degrees Fahrenheit. Most doctors consider a rectal temperature of 100.4 F or higher as a fever.

When should you worry about a baby’s fever?

Call Your Doctor If: Any serious symptoms occur such as trouble breathing. Fever goes above 104° F (40° C) Any fever occurs if less than 12 weeks old. Fever without other symptoms lasts more than 24 hours.

Is a temperature of 99 a fever for a baby?

Your child has a fever if he or she: Has a rectal, ear or temporal artery temperature of 100.4 F (38 C) or higher. Has an oral temperature of 100 F (37.8 C) or higher. Has an armpit temperature of 99 F (37.2 C) or higher.

What should I do if my 4 month old has a fever?

You may be able to treat the fever at home with the following methods:

  1. Acetaminophen. If your child is over 3 months, you can offer them a safe amount of children’s acetaminophen (Tylenol).
  2. Adjust their clothing.
  3. Turn down the temperature.
  4. Give them a lukewarm bath.
  5. Offer fluids.

How do you take a 3 month old temperature?

Tips for Taking Temperatures by Age

  1. For babies younger than 3 months, you’ll get the most reliable reading by using a digital thermometer to take a rectal temperature.
  2. For babies between 3 months and 6 months old, a digital rectal thermometer is still the best choice.

Is 100.5 a fever for a 3 month old?

No matter what, if your baby is younger than 3 months old with a fever of 100.5 or higher, call your doctor.

What temp should I take child to hospital?

If your child is 3 or older, visit the pediatric ER if the child’s temperature is over 102 degrees for two or more days. You should also seek emergency care if the fever is accompanied by any of these symptoms: Abdominal pain. Difficulty breathing or swallowing.

What fever is too high for a baby?

Call your doctor if you have an: infant younger than 3 months old with a rectal temperature of 100.4°F (38°C) or higher. older child with a temperature of higher than 102.2°F (39°C)

Is 99.1 a fever in baby?

A rectal temperature between 99 and 100 degrees is a low-grade fever, and usually does not need a doctor’s care. Fever in newborns may be due to: InfectionFever is a normal response to infection in adults, but only about half of newborns with an infection have a fever.

Is 99.5 considered a fever in a baby?

The American Academy of Pediatrics (AAP) recommends you use a digital thermometer. It’s best to take the temperature rectally for children ages three and younger. A rectal temperature of more than 100.4 degrees is considered a fever. When taken orally, a temperature higher than 99.5 degrees is diagnosed as a fever.

What temp should I take my 4 month old to the hospital?

If his or her temperature is above 100.4 degrees, it is time to call us. For children ages three months to three years, call us if there is a fever of 102 degrees or higher. For all kids three years and older, a fever of 103 degrees or higher means it is time to call Pediatrics East.

When should I take my 4 month old to the ER for a fever?

Talk to your child’s provider or go to the emergency room when:

  1. Your child does not act alert or more comfortable when their fever goes down.
  2. Fever symptoms come back after they had gone away.
  3. The child does not make tears when crying.
  4. Your child does not have wet diapers or has not urinated in the past 8 hours.

What is a low grade fever in babies?

With babies and children older than 6 months, you may need to call if the temperature is greater than 103, but more than likely, associated symptoms will prompt a call. A rectal temperature between 99 and 100 degrees is a low-grade fever, and usually does not need a doctor’s care.

Do you add 1 degree under the armpit?

Axillary, or armpit temperature is the least accurate of the three. An armpit temperature is generally 1 degree lower than an oral temperature. It can be nearly 2 degrees lower than a rectal temperature, which is the most accurate.

Is 100.5 a high fever for a baby?

Fever in Children From Birth to 3 Years Old. What is a fever? Fever is a common symptom of illness. We define a fever as a temperature of 100.5 F (38 C) or higher.

At what temp should you go to the hospital?

Call your doctor if your temperature is 103 F (39.4 C) or higher. Seek immediate medical attention if any of these signs or symptoms accompanies a fever: Severe headache.

How long can a child have a 103 fever?

For all kids three years and older, a fever of 103 degrees or higher means it is time to call Pediatrics East. If a fever of 102 degrees or higher lasts for more than two days, please give us a call, too.

Is 99.2 a fever for baby?

Is 99.3 a fever for a baby?

Additional tips. A baby’s normal temperature range: Under the arm is 97.5 to 99.3 degrees Fahrenheit or 36.5 to 37.4 degrees Celsius. Rectal is 100.2 degrees Fahrenheit or less, or 37.9 degrees Celsius or less.