Consider all the child's symptoms, not just temperature. iStockphoto.com hide caption

itoggle caption iStockphoto.com

Niklas Capps gets ready for recess at Clara Barton Center for Children in Cabin John, Md., Feb. 11. Teachers at the school focus on promoting self-control. Maggie Starbard/NPR hide caption

itoggle caption Maggie Starbard/NPR

Fountain, the 3-year-old son of NPR member station reporter Sarah Varney, doesn't seem to have much interest in eating healthy foods. Sarah Varney for NPR hide caption

itoggle caption Sarah Varney for NPR

Michelle Obama gives a talk at the North Point Community Church in Alpharetta, Ga., on Wednesday about her "Let's Move!" campaign. John Amis/AP hide caption

itoggle caption John Amis/AP

Brett Hallman had a surgery — as a 25-week fetus — to treat his spina bifida. Now, he's an active first grader who enjoys swimming and other sports. Courtesy of Tara and Jake Hallman hide caption

itoggle caption Courtesy of Tara and Jake Hallman

First lady Michelle Obama promotes the Let's Move! campaign and the NFL's Play 60 anti-obesity initiative on Sept. 8 in New Orleans. Gerald Herbert/AP hide caption

itoggle caption Gerald Herbert/AP