How Can I Tell If My Newborn Has a Fever: Key Signs

✅Check for a hot forehead, sweating, irritability, and poor feeding. Use a digital thermometer for accurate readings. Seek medical advice if concerned.


Recognizing a fever in your newborn can be challenging, especially for first-time parents. It is essential to understand the key signs and symptoms that indicate your baby may have a fever. A fever in newborns is generally defined as a rectal temperature of 100.4°F (38°C) or higher. Knowing how to accurately measure your baby’s temperature and identifying other signs of fever can help you take the necessary steps to ensure their well-being.

In this article, we’ll explore the key indicators that your newborn may have a fever, along with tips on how to measure their temperature effectively. Understanding these signs will help you respond promptly and seek medical advice when needed, ensuring the health and safety of your little one.

Common Signs of Fever in Newborns

While a high temperature is a primary indicator of fever, there are several other signs to look out for:

  • Warm Forehead: One of the first signs parents notice is a warm or hot forehead. Although this is not a definitive indicator, it can be a preliminary sign.
  • Unusual Fussiness: Newborns with a fever may become more irritable and difficult to soothe.
  • Decreased Appetite: If your baby is feeding less than usual, it might be a sign of fever.
  • Changes in Sleep Patterns: Fever can disrupt your newborn’s sleep, causing them to sleep more or less than usual.
  • Flushed Skin: Look for redness or warmth in the skin, especially on the face and torso.
  • Shivering: Some babies may experience shivering or chills when they have a fever.

How to Measure Your Newborn’s Temperature

Accurately measuring your newborn’s temperature is crucial in determining if they have a fever. Here are the steps to follow:

  1. Use a Digital Thermometer: A digital thermometer is recommended for accuracy and ease of use.
  2. Rectal Temperature: For newborns, a rectal measurement is the most accurate. Lubricate the tip of the thermometer with petroleum jelly and insert it about 1/2 to 1 inch into the baby’s rectum.
  3. Hold Steady: Hold your baby still and wait for the thermometer to beep, indicating that the measurement is complete.
  4. Read the Temperature: Remove the thermometer and read the temperature. A reading of 100.4°F (38°C) or higher is considered a fever.

When to Contact a Doctor

If your newborn has a fever, it’s essential to know when to seek medical advice. Contact your healthcare provider if:

  • Your baby is younger than 3 months old and has a fever.
  • The fever persists for more than 24 hours.
  • They show signs of dehydration, such as fewer wet diapers or dry mouth.
  • They have difficulty breathing or show other signs of distress.
  • They have a rash, persistent vomiting, or diarrhea.

By understanding these key signs and knowing how to measure your newborn’s temperature accurately, you can better monitor their health and take appropriate action if they develop a fever.

How to Accurately Measure a Newborn’s Temperature at Home

To accurately measure a newborn’s temperature at home is crucial for monitoring their health and detecting fever early. Here are some key steps to follow when measuring your newborn’s temperature:

1. Choose the Right Thermometer:

There are different types of thermometers available in the market, such as digital thermometers, ear thermometers, forehead thermometers, and pacifier thermometers. For newborns, it is recommended to use a digital rectal thermometer for the most accurate reading.

2. Prepare the Thermometer:

Before taking your newborn’s temperature, make sure to clean the thermometer with alcohol and warm, soapy water. Shake the thermometer gently to ensure it is at room temperature.

3. Position your Newborn:

Place your newborn on a flat surface, such as a changing table, and make sure they are calm and still. For rectal temperature measurement, gently insert the thermometer into the baby’s rectum about half an inch.

4. Wait for the Reading:

Follow the instructions for the thermometer to know how long you need to wait for an accurate reading. Avoid taking the temperature immediately after feeding, as it may affect the results.

By following these steps, you can ensure that you are measuring your newborn’s temperature correctly and reliably. It is essential to keep a record of your baby’s temperature readings and consult a healthcare provider if you notice any abnormal readings or symptoms.

Common Causes of Fever in Newborns and When to Worry

When it comes to fever in newborns, it’s crucial to be aware of the common causes and know when to seek medical attention. Fever in newborns can be a sign of an underlying health issue, so understanding the potential causes is essential for proper care.

Common Causes of Fever in Newborns:

Infections are one of the primary reasons newborns develop a fever. Bacterial infections, such as meningitis or urinary tract infections, can lead to elevated body temperature. Viral infections like respiratory syncytial virus (RSV) can also cause fevers in newborns. Additionally, ear infections and gastrointestinal infections are common culprits of fevers in this age group.

Inflammatory conditions like Kawasaki disease can also result in fever in newborns. Other causes may include teething or overbundling the baby, which can lead to overheating.

When to Worry:

While fevers are common in newborns, there are certain signs that indicate a more serious issue requiring immediate medical attention. If your newborn is under three months old and has a rectal temperature of 100.4°F (38°C) or higher, you should contact your healthcare provider right away. Other concerning symptoms to watch for include irritability, lethargy, poor feeding, difficulty breathing, or a rash.

It’s important not to ignore a fever in a newborn, especially if it is accompanied by other symptoms. Prompt medical evaluation can help identify the underlying cause and ensure appropriate treatment.

Frequently Asked Questions

How can I measure my newborn’s temperature?

You can use a digital thermometer to take your newborn’s temperature under the armpit.

What is considered a fever in a newborn?

A rectal temperature of 100.4°F (38°C) or higher is considered a fever in a newborn.

When should I call the doctor if my newborn has a fever?

You should call the doctor immediately if your newborn is under 3 months old and has a fever.

Can teething cause a newborn to have a fever?

Teething may slightly raise a newborn’s temperature, but a fever is not usually caused by teething.

How can I help reduce my newborn’s fever?

You can give your newborn infant acetaminophen or ibuprofen as directed by your pediatrician to help reduce a fever.

Should I bundle up my newborn if they have a fever?

No, you should dress your newborn lightly if they have a fever to help lower their body temperature.

  • Use a digital thermometer to measure temperature accurately.
  • Keep a record of your newborn’s temperature readings.
  • Consult your pediatrician for guidance on fever management.
  • Monitor for other signs of illness besides fever.
  • Avoid overdressing your newborn if they have a fever.
  • Seek medical attention if your newborn has a fever accompanied by other concerning symptoms.

Feel free to leave your comments below and check out our other articles for more helpful tips on newborn care!

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