Abstract: A child-safety door locking system for an automobile door has a shield movable relative to the interior door panel of the door between a retracted inoperative position corresponding to a normal lock mode and an extended operative position corresponding to a guard lock mode. In the inoperative position the shield is withdrawn from the manual lock actuator of the door whereby in the locked position the manual lock actuator may be manually grasped and moved to its unlocked position. In the operative position the shield occupies a position relative to the door panel and manual lock actuator so that the manual lock actuator is shielded in its locked position to block access to the manual lock actuator for manual movement to its unlocked position. The lock actuator is otherwise moveable to its unlocked position when the shield is in its operative position.