More Information about Asthma from top-ranked hospitals in the US:

The Children’s Hospital of Philadelphia:
Asthma - The Children's Hospital of Philadelphia

Cincinnati Children’s Hospital:
Asthma - Cincinnati Children's

Boston Children’s Hospital:
Asthma - Boston Children's

National Jewish Health:

Asthma - National Jewish Health Hospital

And from these organizations:

American Lung Association:
Asthma and Children Fact Sheet

CDC (US Center for Disease Control) Handouts:
Asthma Fast Facts for Kids

Asthma - Center for Disease Control and Prevention