Use a booster seat correctly in a back seat every time your child rides in a car.
Older kids get weighed and measured less often than babies, so check your child's growth a few times a year. Use a booster seat until your child weighs between 80 and 100 pounds, is about 4 feet, 9 inches tall and can pass the Safety Belt Fit Test. For most children, that will be between ages 8 and 12.
Tell all drivers who transport your child that booster seat use is a must when your child is in their vehicle.
A booster seat uses no harness. It uses the vehicle's lap and shoulder belts only. Be sure the safety belt is properly buckled.
Booster seats are not installed tightly. They sit on the vehicle seat; the child buckles the lap and shoulder belt and wears the safety belt like you do. Never use only the lap belt.
Use the vehicle's lap and shoulder belts on every booster seat. Never place the shoulder belt under the child's arm or behind the child's back.
Be sure all occupants wear safety belts correctly every time. Children learn from adult role models.