When does a child no longer have to sit in a booster?

A child typically no longer needs to use a booster seat when they reach a height of 4 feet 9 inches (145 cm) and are between 8 to 12 years old, depending on state laws and guidelines. They must also be able to sit with their back against the vehicle seat, knees bent over the edge, and the seatbelt fit properly across their shoulder and lap. It's essential to check local regulations, as requirements can vary. Always prioritize safety and proper seatbelt fit over age or size alone.