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What Fever is Bad in Babies?

Published in Baby Fever 2 mins read

A fever in babies requires careful attention, and the severity is often determined by the baby's age and temperature. Here's a breakdown:

When to Worry About a Baby's Fever

It's crucial to monitor a baby's temperature closely and know when to seek medical attention. According to medical guidelines, a fever can be considered concerning based on these factors:

  • Age Under 3 Months: A rectal temperature of 100.4°F (38°C) or higher is considered serious and requires an immediate call to the doctor.
  • Age 3 Months or Older: A temperature higher than 102.2°F (39°C) warrants a call to the doctor.

Understanding Fever in Babies

A fever is a rise in body temperature, usually a sign that the body is fighting off an infection. While a fever is not inherently dangerous, it can be a symptom of a serious condition, particularly in young babies.

Key Indicators

Here is a quick guide to help you identify when a baby's fever could be dangerous:

  • High Temperature: Temperatures mentioned above, especially in young infants, are cause for concern.
  • Behavior: Pay attention to the baby's behavior, such as lethargy, fussiness, poor feeding, or difficulty waking up. These symptoms can indicate a need for medical attention.
  • Other Symptoms: Look for other symptoms, such as a rash, difficulty breathing, or signs of dehydration, which may signal more severe issues.

What to Do

If your baby has a fever:

  • Monitor: Keep track of the baby's temperature and any other symptoms.
  • Hydration: Ensure the baby is getting enough fluids, such as breast milk or formula.
  • Contact Your Doctor: Do not hesitate to contact your pediatrician if you are unsure. They might have specific guidelines on when you need to call them.


Baby's Age Concerning Temperature Action
Under 3 Months Rectal temperature of 100.4°F (38°C) or higher Call the doctor immediately.
3+ Months Temperature higher than 102.2°F (39°C) Contact the doctor.


Note: Always trust your instincts and consult with your doctor if you are ever concerned about your baby's health, regardless of temperature readings.

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