The rear - facing car seat's anti-rebound bar extends up toward
the back of the vehicle seat and limits the amount of motion possible in case of an... MORE accident therefore decreasing the amount of motion for the baby's head and body.
The bar «is used to stabilize the car seat in the event of a collision, significantly reducing the distance it will rotate and preventing your child's head from contacting
the back of the vehicle seat.»
Without a rebound bar, this means a baby could be violently pushed against
the back of the vehicle seat, increasing risks of head, neck and spine injury.
In some larger vehicles such as vans, pickup trucks, and SUVs, these tether anchors may be found on
the back of a vehicle seat, on the floor, the ceiling, or other location.
Legs of a toddler touch
the back of the vehicle seat at an early age which is why a dirt cover is a good idea.
The more the kids grow older, their feet will touch
the back of the vehicle seat.
Sometimes the anchor points were on
the backs of vehicle seats, which had to be folded down before a tether could be installed.