Correct Restraint: This simulation shows how a 6-year-old child properly restrained in a belt-positioning booster seat barely moves during a 35 mph crash. Diagram and caption courtesy of Children's Hospital of Philadelphia.

Incorrect Restraint: The same child, improperly restrained in an adult lap-and-shoulder belt, is thrown forward dramatically in the same crash. The inappropriate fit of the seat belt puts the child at risk for severe head, spine, and abdominal injury. Diagram and text courtesy of Children's Hospital of Philadelphia.

Incorrect Restraint: The same child, improperly restrained in an adult seat belt with the shoulder belt behind the back, is thrown forward dramatically in the same crash. The inappropriate fit of the seat belt and lack of upper body restraint puts the child at risk for severe head, spine, and abdominal injury. (Placing the seat belt behind the back is a common and dangerous mistake children make when the shoulder belt doesn't fit properly.) Diagram and text courtesy of Children's Hospital of Philadelphia.