SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/dad-fever-infant-100

A baby under 3 months has a temperature of 100.4°F or higher. What should a parent do?

Call the doctor right away.

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  1. Wait until morning to see
  2. Call the doctor right away ✔
  3. Give a cool bath and recheck

Why: In a very young baby, even a fever can signal a serious infection. The AAP says to call right away for 100.4°F (38.0°C) or higher in a baby under 3 months.

Huh, didn't know that: The AAP also says to call if a child of any age has a fever that keeps rising above 104°F (40°C).

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Why did the banana go to the doctor? He was not "peeling" well.
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References

Answer: Call the doctor right away. In a very young baby, even a fever can signal a serious infection. The AAP says to call right away for 100.4°F (38.0°C) or higher in a baby under 3 months.

  1. AAP HealthyChildren.org: When to Call the Pediatrician www.healthychildren.org/English/health-issues/conditions/fever/Pages/When-to-Call-the-Pediatrician.aspx
    Is younger than 3 months (12 weeks) and has a temperature of 100.4°F (38.0°C) or higher.
    Checked 2026-10-10.

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