FTF recommends a nifty device that ensures parents that their children are never too far away.

Giggle Bug Toddler Tracker is a unique and affordable tracker that provides parents and care-givers the ability to locate a missing child indoor or out with a touch of a button. The Giggle Bug (weighing approximately one ounce) will beep and the eyes of the bug will blink until the child is located and the adult de-activates the unit. The tracker is designed to be used with children ages 18 months to 6 years, and is ideal for malls, parks, and airports.  Plus the radio frequency function both inside and outdoors.