SafetyAge 0-3 yearsEvidence-based

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Fever and Emergency Steps: A Midnight Guide for Parents

Published January 18, 2026Updated January 18, 2026

Quick Answer

A fever is a rectal temperature > 100.4°F (38°C). Call a doctor immediately for babies under 3 months. For older babies, treat discomfort with Acetaminophen.

Key Takeaways

  • A fever is a rectal temperature > 100.4°F (38°C)
  • Under 3 months: Call doctor immediately for any fever
  • Do not use aspirin for children
  • Focus on the child's behavior, not just the number
# Fever and Emergency Steps: A Midnight Guide Waking up to a burning hot baby is scary. Here is your step-by-step medical guide. ## 1. Confirm the Fever - **Gold Standard**: Rectal thermometer is most accurate for babies < 3 years. - **Threshold**: A fever is **100.4°F (38°C)** or higher. - _Note: Touch/forehead feeling is unreliable._ ## 2. Red Flags: When to Call NOW ### Call Doctor Immediately or Go to ER if: - **Baby is < 3 months old** with fever > 100.4°F (Do not give meds before calling). - **Lethargic**: Hard to wake up, unresponsive. - **Dehydrated**: No wet diaper for 8+ hours, no tears when crying, dry mouth. - **Breathing**: Fast breathing, flaring nostrils, grunting, or ribs sucking in. - **Rash**: Purple/red spots that don't fade when pressed (Glass test). - **Seizure**: Convulsions (Febrile seizure). Call 911 if it lasts > 5 mins. ## 3. Managing Symptomatic Fever (Home Care) If baby is > 3 months, alert but fussy: ### Medication - **Acetaminophen (Tylenol)**: Safe for 0+ months (Check dosage with doctor). generally every 4-6 hours. - **Ibuprofen (Motrin/Advil)**: **ONLY for 6+ months**. Every 6-8 hours. - **Never Aspirin**: Causes Reye's Syndrome. ### Comfort Measures - **Fluids**: Breastmilk, formula, or Pedialyte (if >1 yr water/popsicles). Hydration is key. - **Clothing**: Dress in light layers. Do not bundle up. - **Room**: Keep cool (68-70°F). - **NO Ice Baths**: Or rubbing alcohol. Use lukewarm water compress if needed. ## 4. Monitoring Check baby every few hours. If fever persists > 24 hours (under 2 years) or > 3 days (over 2 years), see a doctor even if no other symptoms.

Frequently Asked Questions

What is considered a fever for a baby?

A rectal temperature of 100.4°F (38°C) or higher.

Can I give Ibuprofen to my infant?

Only if the baby is 6 months or older. Under 6 months, Acetaminophen (Tylenol) is generally safe.

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

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