There's an absolutely bogus article on Runner's World about a fourteen-month-old finishing a marathon. There were three diaper changes, a nap, and she finished in 9 hours and 24 minutes. Barefoot. And she wants to start her own line of gluten-free energy bars.
Truly believable photoshop effort.
There is a mention of actual young runners so apparently it's intended to be an over-the-top look at young distance runners. (Insert forced laughter here.)