A child who has outgrown a forwardfacing child seat should ride in a back seat and use a booster seat until the lap/shoulder belt fits them properly without the booster.
Some states, Canadian provinces and territories also require children to use a booster seat until they reach a given age or weight (e.g., 6 years or 60 lbs). Be sure to check current laws in the states, provinces or territories where you intend to drive.
Booster seats can be high-back or low-back. Whichever style you select, make sure the booster seat meets federal safety standards and that you follow the booster seat maker’s instructions.
If a child who uses a booster seat must ride in front, move the vehicle seat as far back as possible and be sure the child is wearing the seat belt properly.
A child may continue using a booster seat until the tops of their ears are even with the top of the vehicle’s or booster’s seat-back. A child of this height should be tall enough to use the lap/shoulder belt without a booster seat.