Somebody mention Chips? I like the kettle cooked Lays!
Old geezer wakin up from his nap regards!
There are a least two types of RFID devices, passive and active. Active devices have a battery and transmit a signal to receivers. Passive devices have a unique shape or design that reflects a correspondingly unique pattern when scanned with a RFID reader. These last a long time and do not need a battery. You could embed passive RFID chips in children at birth containing unique identification information. They could be read by readers the person walks through/near, or by a hand held scanner. These have the limitation that you must be in close proximity to a reader to track the child. They should last for life but may migrate to other parts of the body where readers might not pick them up as readily.
To the original question, NO, if I had kids, I can't imagine allowing them to carry one of these around.
Ahhh implanting the citizenry with chips starting at childhood. Creepy....