When can my child transition out of a booster seat to using just the vehicle seat belt?
A booster seat is no longer needed once the vehicle seat belt fits properly, which typically occurs when the child reaches 4 feet 9 inches tall and is between ages 8-12. Be sure to check your local and state laws, as well as AAP and NHTSA recommendations, for car seat usage guidelines. (Page 2)
From the official Graco 4Ever DLX 4-in-1 Car Seat manual, page 2
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