How to Use the Child Fever Checker
When a child spikes a fever, deciding whether to rush to the doctor or wait it out at home is one of the hardest calls a parent has to make. This checker follows American Academy of Pediatrics (AAP) fever guidance, using your child's age in months, temperature, how long the fever has lasted, and any warning signs to tell you whether it's time for the ER, a same-day doctor visit, or safe to monitor at home.
The AAP strongly recommends that any infant under 3 months old with a temperature of 100.4°F or higher get immediate emergency care, no matter how mild the fever looks — at this age, the immune system is still immature, and a bacterial infection can progress to sepsis quickly. For children 3 months and older, warning signs like lethargy, trouble breathing, a stiff neck, a rash that doesn't fade under pressure, or a seizure matter more than the number on the thermometer alone.
Check the FAQ below for age-specific thresholds and emergency warning signs. This result is reference guidance based on general guidelines, not a medical diagnosis — if you're at all worried about your child, contact a doctor or ER right away regardless of what this tool shows.
Frequently Asked Questions
Yes. Under AAP guidelines, an infant under 3 months old with a temperature of 100.4°F or higher needs immediate medical care regardless of how mild the fever seems. Their immune systems are immature, so infections can worsen quickly.
No. This result is reference guidance based on general AAP guidelines, not a medical diagnosis. If you're at all worried about your child, contact a doctor or ER regardless of what this tool shows.