Baby Fever: Complete Parent's Guide to Recognition and Treatment 2025

Everything you need to know about managing fever in babies and infants

🚨 When to Call 911 Immediately

  • Difficulty breathing or turning blue
  • Seizure or convulsions
  • Unresponsive or extremely lethargic
  • Signs of severe dehydration

🌡️ What is Considered a Fever in Babies?

A fever in babies is defined as a body temperature of 100.4°F (38°C) or higher when taken rectally. Understanding what constitutes a fever and how to accurately measure your baby's temperature is crucial for proper care.

  • Rectal (most accurate): 100.4°F (38°C) or higher
  • Oral: 100°F (37.8°C) or higher
  • Armpit: 99°F (37.2°C) or higher
  • Ear (tympanic): 100.4°F (38°C) or higher

⚠️ Age-Specific Fever Guidelines

  • 0-3 months: Any fever requires immediate medical attention
  • 3-6 months: Fever over 102°F (38.9°C) needs medical evaluation
  • 6+ months: Monitor symptoms, call if fever persists or child seems very ill

🏠 Home Treatment for Baby Fever

  • Keep baby hydrated: Offer frequent feedings
  • Dress lightly: Light clothing and room temperature environment
  • Monitor closely: Check temperature regularly
  • Comfort measures: Extra cuddles and rest

💊 Fever Medications for Babies

Always consult your pediatrician before giving fever medication to babies under 6 months.

  • Acetaminophen (Tylenol): Safe for babies 2+ months
  • Ibuprofen (Advil/Motrin): Only for babies 6+ months
  • Never give aspirin: Risk of Reye's syndrome

📞 When to Call Your Pediatrician

  • Fever in baby under 3 months (any fever)
  • Fever over 102°F in baby 3-6 months
  • Fever lasting more than 24 hours in babies under 2 years
  • Baby seems very sick regardless of temperature
  • Signs of dehydration or difficulty feeding