A child can remain completely out of our line of vision when relying on our mirrors. It is very easy to hit a child causing serious injury when reversing out of a parking space or a garage.
To prevent this, you must ensure that there are no children nearby, if there are, ask them to stand in front or by the side of the vehicle at a reasonable distance where they can be seen. Somebody helping you from outside the vehicle can also be very useful.
It is important to always ensure that the maneuver is safe, even if the vehicle is equipped with a rear view camera or an obstruction detection system.