Children at least 4 years of age but less than 7 and who measure less than 4'9? or weigh less than 65 pounds shall use a belt positioning booster seat system meeting applicable federal motor vehicle safety standards.
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4 – 7 YearsKeep your child in a forward-facing car seat with a harness and tether until he or she reaches the top height or weight limit allowed by your car seat's manufacturer. Once your child outgrows the forward-facing car seat with a harness, it's time to travel in a booster seat, but still in the back seat.
Yes, backless booster seats are safe. They serve to position your child so they can be protected by a seat belt. Backless booster seats may be as safe as high back boosters, though there aren't many studies comparing the two.
Children 0 through 3 years or under 40 pounds must use a car seat. Children 4 through 7 years and more than 40 pounds and over 57 inches should use a booster seat. Adult seat belts are allowed at 8 years old.