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What Is a Normal Baby Temperature?

Published February 10, 2026Updated February 10, 2026

Quick Answer

A normal baby temperature involves a range between 97°F and 100.4°F (36.1°C to 38°C). This range varies slightly by the method of measurement.

Key Takeaways

  • A normal baby temperature involves a range between 97°F and 100.4°F (36.1°C to 38°C). This range varies slightly by the method of measurement.
  • Evidence shows that a normal body temperature for infants is generally between 97°F and 100.4°F (36.1°C to 38°C) - according to the American Academy of Pediatrics (AAP).
  • The CDC recommends checking a baby's temperature using a digital thermometer for the most accurate readings.
  • Studies indicate that infants may have varying temperature ranges depending on the method of measurement, such as oral, rectal, or axillary - as noted by the AAP.
  • According to CDC guidelines, a rectal temperature of 100.4°F (38°C) or higher is considered a fever, requiring further assessment.
  • WHO guidelines suggest that caregivers should monitor infants' temperatures regularly, especially in the first few months of life.
  • Research published in Pediatrics shows that accurately measuring a baby’s temperature can help detect illnesses early.

Quick Answer

A normal baby temperature involves a range between 97°F and 100.4°F (36.1°C to 38°C). This range varies slightly by the method of measurement.

What You Need to Know

Understanding what constitutes a normal temperature for babies is crucial for monitoring their health, especially in the first few months of life. Newborns and infants are particularly vulnerable to illnesses, and their body temperature can fluctuate based on various factors such as age, activity level, and the time of day. It is important for parents and caregivers to be aware of normal ranges and how to measure temperature accurately.

Evidence-Based Guidelines

According to the American Academy of Pediatrics (AAP), a normal body temperature for infants typically ranges from 97°F to 100.4°F (36.1°C to 38°C). The CDC recommends using a digital thermometer for the most accurate readings. Research indicates that rectal temperatures are generally the most accurate for infants, especially those under three months of age.

The CDC also states that if a baby reaches a rectal temperature of 100.4°F (38°C) or higher, it is considered a fever and requires further evaluation. WHO guidelines suggest that caregivers should monitor their infant's temperature regularly, particularly in the early months, to ensure prompt recognition of potential health issues.

Step-by-Step Guide

  1. Choose the Right Thermometer: Select a digital thermometer that is appropriate for infants, preferably one designed for rectal use for the most accurate readings.
  2. Prepare for Measurement: Ensure the thermometer is clean and ready for use according to the manufacturer’s instructions. If taking a rectal temperature, apply a small amount of lubricant like petroleum jelly to the tip.
  3. Take the Temperature: For a rectal temperature, gently insert the thermometer about half an inch into the rectum and hold it in place until it beeps or indicates it's finished. For other methods, follow the specific instructions for that thermometer.
  4. Read and Record the Temperature: After the thermometer indicates the reading, record the temperature and the method used. If the temperature is outside the normal range, consult your pediatrician.

Common Questions Parents Ask

In this section, we address frequently asked questions related to baby temperature that many parents may have.

Safety Considerations

When measuring a baby's temperature, it's essential to follow safety precautions to avoid injury. Always use a thermometer designed for infants and never leave a baby unattended while taking their temperature. If using a rectal thermometer, ensure it is specifically designed for that purpose and handle it carefully to prevent any injury. If you are unsure of the correct method or have concerns about your baby's health, consult with your pediatrician.

When to Contact Your Pediatrician

It is crucial to know when to seek medical attention for your baby. Contact your pediatrician if your baby is less than three months old and has a rectal temperature of 100.4°F (38°C) or higher. Additionally, if your baby exhibits any signs of distress, such as persistent crying, lethargy, poor feeding, or unusual irritability, you should reach out to a healthcare professional.

The Bottom Line

Monitoring your baby's temperature is an essential aspect of their health care. A normal temperature typically ranges from 97°F to 100.4°F (36.1°C to 38°C), with rectal measurements being the most accurate for infants. Regularly checking your baby's temperature, especially in the first few months, can help in early detection of illnesses. Always consult your pediatrician if you have any concerns about your baby's health.

Frequently Asked Questions

What is the best way to take a baby's temperature?

The best way to take a baby's temperature is rectally, as it provides the most accurate measurement. However, digital thermometers can also be used orally or axillary, but rectal readings are preferred for infants under three months.

How can I tell if my baby has a fever?

A baby is considered to have a fever when their rectal temperature reaches 100.4°F (38°C) or higher. It's important to regularly monitor their temperature, especially if they show signs of illness.

Is it normal for a baby's temperature to fluctuate?

Yes, it is normal for a baby's temperature to fluctuate throughout the day. Factors such as activity level, time of day, and even the method of measurement can cause variations in temperature.

When should I worry about my baby's temperature?

You should contact your pediatrician if your baby is under three months and has a rectal temperature of 100.4°F (38°C) or higher. Additionally, any persistent fever or accompanying symptoms like irritability, lethargy, or poor feeding should prompt a call to your pediatrician.

Are there different temperature ranges for babies of different ages?

The normal temperature range for babies remains largely the same from birth through the first few months. However, older infants may exhibit slightly different responses to fevers and illnesses. Always consult your healthcare provider for age-specific advice.

Step-by-Step Guide

1

Choose the Right Thermometer

Select a digital thermometer that is appropriate for infants, preferably one designed for rectal use for the most accurate readings.

2

Prepare for Measurement

Ensure the thermometer is clean and ready for use according to the manufacturer’s instructions. If taking a rectal temperature, apply a small amount of lubricant like petroleum jelly to the tip.

3

Take the Temperature

For a rectal temperature, gently insert the thermometer about half an inch into the rectum and hold it in place until it beeps or indicates it's finished. For other methods, follow the specific instructions for that thermometer.

4

Read and Record the Temperature

After the thermometer indicates the reading, record the temperature and the method used. If the temperature is outside the normal range, consult your pediatrician.

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💡 Note: This content is curated from official health organization guidelines. For original source citations, see the "Sources" section above.

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Medical Disclaimer

This content is educational and does not replace professional medical advice. Always consult your pediatrician for personal health concerns.

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