The Center for Disease Control, Heads Up program, provides information on concussions, prevention, symptoms, and treatment. The following links provide access to the CDC, Heads Up home page, as well as, a Fact Sheet for Parents to help understand concussions.
CDC Heads Up webpage:
http://www.cdc.gov/headsup/index.html
CDC Heads Up, Parent Fact Sheet (English):
http://www.cdc.gov/headsup/pdfs/schools/tbi_factsheets_parents-508-a.pdf
CDC Heads Up, Parent Fact Sheet (Spanish):
http://www.cdc.gov/headsup/pdfs/schools/tbi_factsheets_parents_spanish-a.pdf