The word "kiddie" is a short form of "kid" or "child". It is often used to describe something that is specifically intended for or targeted towards children, like a kiddie pool or a kiddie ride. Full definition
This home features access to a large community pool with kiddie pool! (houserebate.com)
It's great to see in 2012 Sony and Zipper still making awesome titles with a great depth in game play for hardcore gamers, and not just churning out rubbish for kiddies who just want everything easy. (metacritic.com)
Tip: Wading pools are a major risk for drowning; more than 200 children in the United States have drowned in kiddie pools in the past decade. (babycenter.com)