Improper use of booster seats puts many kids at risk

About two-thirds of children's booster car seats may be improperly installed or are being misused, a new analysis shows.

Researchers evaluated 564 children using booster seats at fast-food restaurants and discount stores in Indiana. Common mistakes observed in the study included shoulder belts being too slack or misplacement of the shoulder restraint under the child's arm, behind their back or over an arm rest.

Most states now require the use of booster seats for children riding in cars and trucks once they outgrow a standard five-point harness car seat. The purpose of the booster seat is to raise the height of a seated child so that an adult-sized shoulder restraint fits properly.

The National Highway Traffic Safety Administration has more about child passenger safety.