But why stop with the Children, lets just tag everyone so we all know where everyone else is all of the time!
I just see it as a bad road to travel, where does it end?
Besides that, what good is the watch going to do if someone does kidnap the child. what, its going to alert you of that fact? Sure they can track it but lets not pretend the would-be kidnappers are going to be completely oblivious to this new tech, sure there may be a few to start. Those that do know about it will just toss it out the window.