When to go in person or call 911
- Fast breathing, ribs or belly pulling in with each breath, nostrils flaring, or grunting
- Blue or gray lips, or struggling to breathe: call 911
- A barky cough with a high-pitched noise when breathing in at rest
- Fever in a baby under 3 months, or a fever that returns after your child started getting better
- Signs of dehydration, or a cough lasting more than 3–4 weeks