To Urge Booster Seat Use By Children In Automobiles. As the name suggests, a booster seat boosts a child up so that the car's seat belts will fit properly. When placed in poorly fitting adult lap and shoulder belts without a booster, the lap portion of the belt can rise over the child's abdomen and the shoulder portion of the belt can cut across the neck and face causing serious internal injuries in a crash.
Children can also slip out of the belt altogether and be ejected in a crash.