how long do i have to use a booster seat
Most kids need to ride in a booster seat from about age four until ages 10 to 12 years. Safety experts recommend that children continue to use a booster seat in the back seat of their vehicles until parents can answer yes to all of the following questions.
8 - 12 Years. Keep your child in a booster seat until he or she is big enough to fit in a seat belt properly. For a seat belt to fit properly the lap belt must lie snugly across the upper thighs, not the stomach. The shoulder belt should lie snugly across the shoulder and chest and not cross the neck or face.