Your Baby's Temperature and Fever (2024)

What is a normal newborn temperature?

Rectal reading: A reading of 98.6° F (37° C) is just the average rectal temp. A normal low can be 96.8° F (36° C) in the morning. It can change to a high of 100.3° F (37.9° C) late in the day.

Mouth reading: A reading of 97.6° F (36.5° C) is just the average mouth temp. A normal low can be 95.8° F (35.5° C) in the morning. It can change to a high of 99.9° F (37.7° C) late in the day.

Source: healthychildren.org

We strongly recommend rectal temperatures when checking a baby as these are the most accurate and will give your pediatrician a better idea on how to proceed.

What is considered a fever in a newborn?

If your newborn has a fever temperature of 100.4° F (38° C) or above, it's important to seek medical attention. Fevers can be a sign of an underlying illness in infants and it's best to talk to a doctor to determine what's normal for your baby. Summer Health can connect you to a pediatrician in 15 minutes to help answer your questions and figure out the right next care steps for your little one.

See Also
Heat Rash

How do babies regulate their temperature?

Babies have a hard time regulating their temperature because their bodies are still developing and they have a larger body surface area relative to their mass, compared to adults. This means that they lose heat faster and have a harder time retaining heat, making it easier for their body temperature to fluctuate.

Additionally, newborns do not have fully developed systems for regulating their body temperature, such as sweating, which helps to cool the body down. These factors combined make it more difficult for newborns to regulate their temperature, which is why they can easily become too hot or too cold.

When should you check your baby’s temperature?

If you notice your baby acting differently or appearing “off”, such as more sluggish, more sleepy, not feeding well, or not acting at their baseline, consider checking their temperature via touch and thermometer. If you don’t have a thermometer, when checking younger babies you can use touch by checking the back of their neck for warmth. If they feel warm and sweaty on the back of their neck, it is best to consult a pediatrician.

If you are looking for baby thermometers to keep track of your little’s temperature, look no further.

How to dress your baby to keep them comfortable?

  1. Layer their clothing: Dress your baby in one more layer than you would wear in the same conditions. For example, if you would wear a short-sleeved shirt and pants, dress your baby in a onesie, shirt, and pants.
  2. Use a hat: Babies lose heat through their heads, so hats are important in cold weather.
  3. Avoid over-bundling: Over-bundling can cause your baby to overheat, leading to sweating, damp clothing, and increased risk of overheating.
  4. Check for comfort: Regularly check your baby's hands and feet to make sure they are not too cold or too hot. If they are warm and comfortable, they are dressed appropriately.
  5. Keep their environment comfortable: Make sure the room temperature is not too hot or too cold for your baby.

In Conclusion

Fevers can be an alarming and confusing ordeal for parents and caregivers. Every baby's needs will be unique, however there are simple steps you can take at home to regulate your newborn’s temperature to have peace of mind. If you have questions about your baby’s temperature or fever, do not hesitate to reach out to Summer Health. We can connect you to licensed pediatricians to answer your questions over text in 15 minutes, 24/7.

Your Baby's Temperature and Fever (2024)

FAQs

Your Baby's Temperature and Fever? ›

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.

When should you worry about a baby's fever? ›

Fever. If your baby is younger than 3 months old, contact your health care provider for any fever. If your baby is 3 to 6 months old and has a temperature up to 102 F (38.9 C) and seems sick or has a temperature higher than 102 F (38.9 C), contact your health care provider.

What is a high temperature for a baby? ›

A normal temperature in babies and children is about 36.4C, but this can vary slightly. A high temperature or fever is usually considered to be a temperature of 38C or above. Your baby may have a high temperature if they: feel hotter than usual to touch on their back or chest.

What temperature to take baby to ER? ›

Also, contact your child's provider or go to the emergency room if your child: Is younger than age 3 months and has a rectal temperature of 100.4°F (38°C) or higher. Is 3 to 12 months old and has a fever of 102.2°F (39°C) or higher. Is under age 2 and has a fever that lasts longer than 48 hours.

How do I bring my baby's fever down? ›

Offer soft foods often and in small amounts but do not force them to eat. Give sponge baths or let your child soak in a tub. Water should be lukewarm, not too hot or cold. Use a wash cloth to sponge the water over your child's body.

What is an alarming fever for a baby? ›

In general, call the doctor if your child is: younger than 3 months old with a rectal temperature of 100.4°F (38°C) or higher. 3 months or older with a temperature higher than 102.2°F (39°C)

How long can a baby safely have a fever? ›

In a child over 4 months, fevers of up to 104 F shouldn't cause alarm. A mild fever that lasts up to five days is OK for most kids.

How to tell if baby is too hot? ›

How to tell if a newborn or infant is too hot
  1. Being warm to the touch.
  2. Reddish or flushed cheeks.
  3. Reddish or hot ears or neck.
  4. Sweating.
  5. Acting fussy or irritable.
Jun 3, 2024

When to take a child to the ER for a fever? ›

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.

Should I let my child's fever run its course? ›

Fever is a sign that the body is combating an infection. It helps kill bacteria and viruses. It also boosts production of infection-fighting white blood cells. There's generally no need to worry about bringing a fever down unless it's causing your child discomfort.

When to worry about a fever? ›

Call your health care provider 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. Rash.

What is a critical temperature for a baby? ›

Emergency departments are equipped for the most complex or critical needs. Fever requires a visit to the emergency department when: An infant less than 28 days old has a fever of 100.4 or more. A child's fever is at 105°F (40.5°C) and doesn't decrease 1-2 degrees after taking fever-reducing medicine.

What will hospital do for baby with high fever? ›

Testing. If your baby is less than 60 days old and has a fever of 100.4 or higher or exhibits other physical symptoms, a series of important tests known as “rule out sepsis” or “fever work up,” will be done.

When should I be concerned about my baby's fever? ›

If they are over 3 months old and still playing, eating, and drinking close to the way they normally would, you probably don't have to worry. If your baby is under 2 months old and has a fever, they need emergency medical attention. If they are over 2 months and are having more severe symptoms, call your doctor.

Should baby wear a sleep sack with fever? ›

If your child has a fever, it is best to dress infants in one light layer of clothing and a sleep sack (no loose blankets should be in your baby's crib). You don't want to bundle them up too much, as this can increase the fever.

Why is my baby's head hot in a fever? ›

Fever tends to produce a warm feel throughout. Not just on forehead. It may be because of influence of environmental temperature as head is the most exposed part in our body. Can be due to dehydration as well.

When should I take my child to the ER for a fever? ›

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.

Why is infant fever an emergency? ›

A fever in the first 3 months of your baby's life is serious. It may be due to a bloodstream infection called sepsis. You should get medical treatment right away for fever in babies in this age group.

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