Rhett Krawitt, 6, outside his school in Tiburon, Calif. Seven percent of the children in his school are not vaccinated. Courtesy of Carl Krawitt hide caption

itoggle caption Courtesy of Carl Krawitt

A marijuana bud displayed in Denver. Don't legalize pot, the pediatricians say, but don't lock teenagers up for using it, either. Seth McConnell/The Denver Post/Getty Images hide caption

itoggle caption Seth McConnell/The Denver Post/Getty Images

Varsity football captain Nahshon Ellerbe is a senior at Trinity Christian Academy in Addison, Texas. Jeffrey McWhorter/Trinity Christian Academy hide caption

itoggle caption Jeffrey McWhorter/Trinity Christian Academy

High school athlete Graham Hill, number 50, suffered a concussion in 2013 while playing football at Trinity Christian Academy in Addison, Texas. Courtesy of Jeffrey McWhorter hide caption

itoggle caption Courtesy of Jeffrey McWhorter

A baked potato with toppings on a lunch tray at a school in Wisconsin. Students are less likely to eat fruits and vegetables if they're rushing to get to recess, researchers say. Micheal Sears/MCT/Landov hide caption

itoggle caption Micheal Sears/MCT/Landov

Dr. Stephen Teach helps Jeffery Ulmer listen to his daughter Alauna's asthmatic breathing at Children's National Medical Center in Washington, D.C. Alauna's mother, Farisa, holds her. The District has one of the highest rates of pediatric asthma in the country. Jahi Chikwendiu/Washington Post hide caption

itoggle caption Jahi Chikwendiu/Washington Post

Bruno Mbango Enyaka gets his flu shot at a community health center in Portland, Maine, on Jan. 7. Gabe Souza/Press Herald via Getty Images hide caption

itoggle caption Gabe Souza/Press Herald via Getty Images

The University of California's Nutrition Policy Institute has proposed that MyPlate include an icon for water. UC Division of Agriculture and Natural Resources hide caption

itoggle caption UC Division of Agriculture and Natural Resources