This is a simple application which keeps your toddler entertained in events in which you got your hands tied to something else such as driving. Once the application has been activated the application locks out other functions of the phone such as calling, or going back to the menu.
Give it a try and save yourself more time for you.
(It does not require to change any android setting.)
Waring: This application is beta version, and it was only tested on Galaxy Series so far. More devices are on test now.