From writing book reports and solving math equations to playing soccer and starring in school musicals, kids are constantly on the go. So they're bound to come down with sore throats, sniffles, and other ailments from time to time. In addition to receiving medical attention when they're sick, it's also important that kids get regular check-ups in order to prevent or catch potentially serious problems. Here, a look at children's health by the numbers.

  • 70. Percentage of children who have had at least one ear infection by the age of 3.

  • 40. Percentage of children under age 5 who live in a smoking household.

  • 200,000. Number of new cases of childhood asthma that are caused by parental smoking each year, according to the American Academy of Family Physicians.

  • Up to 6. Percentage of children under age 3 who have some sort of food allergy.

  • 25 million. Number of U.S. children who are overweight or nearly overweight, according to the Centers for Disease Control and Prevention.

  • 28. Percentage of children ages 2 to 5 who develop cavities in their baby teeth.

  • 30,000. Number of U.S. children diagnosed with type 1 diabetes each year.

  • 3 to 5. Percentage of U.S. school-age children affected by attention-deficit hyperactivity disorder (ADHD), according to the National Institute of Mental Health.

  • 83. Percentage of parents who put sunscreen and protective clothing on their children prior to going outside.