Child Lock (Child Safety Lock)

It is usually a small lever or slot on the door edge. Some cars switch it electrically from the driver's door. The door can still be opened from outside. Child locks are separate from the central locking, so a locked car can still have child locks off. Remembering to switch them off when adults travel in the back avoids passengers being unable to exit. Rear window locks prevent children from opening windows.

The lock disconnects the inner handle from the latch.

Check that it is active when children are in the back. Rear window locks are often switched separately.