ER now: any fever of 100.4 F or more under 3 months old, or fever with stiff neck, non-blanching purple rash, breathing trouble, blue lips, a seizure over 5 minutes, or a child who is floppy and hard to wake. Call today for 104 F, fever past 3 days, or fever that returns after a day away.
The reassuring context: fever is the immune system working, MedlinePlus notes infection-driven fevers rarely top 105 F, and febrile seizures, while terrifying, are usually brief and outgrown. Home care for the ordinary kind: constant fluids, light clothing, acetaminophen or ibuprofen by weight for comfort, never aspirin, and no ibuprofen under 6 months. The behavior rule outranks the thermometer: a drinking, playing, eye-contact-making kid at 102 F is less concerning than a listless one at 100.5 F. Trust the kid, not just the number.
What to do
Common questions
When is a kids fever an emergency?
Fever itself is the immune system working, and in kids over 3 months it is rarely dangerous by itself; the emergency call depends on age, the number, and the company it keeps. The 911-or-ER-now list: any fever of 100.4 F (38 C) or higher in a baby under 3 months (their immune systems are immature and this is always same-day evaluated); fever with a stiff neck, severe headache, or pain when bending the head forward; a purple or blood-colored rash that does not blanch when pressed; trouble breathing, blue lips, or severe lethargy (hard to wake, floppy, not making eye contact); a seizure lasting over 5 minutes or repeated seizures; signs of dehydration (no wet diapers 6-plus hours, no tears, sunken soft spot); or inconsolable crying that nothing soothes. The call-the-doctor-today list: fever reaching 104 F (40 C), fever lasting past 3 days, fever that disappears for 24-plus hours then returns, or fever in a child with a chronic condition or on immune-suppressing medicine. The context that calms parents: febrile seizures, though terrifying, are usually brief, harmless, and outgrown, per MedlinePlus, and fever from common infections rarely exceeds 105 F. Home management for the ordinary kind: fluids constantly, light clothing, and acetaminophen or ibuprofen dosed by weight for comfort (never aspirin, and no ibuprofen under 6 months). You are treating misery, not the number: a happy, drinking, playing kid at 102 F worries doctors less than a listless one at 100.5 F.