In preschool-aged children, a belt-positioning booster is recommended until the lap and shoulder belt fit properly. This typically occurs at approximately which height or age?

• A. 4 ft 9 in tall
• B. 3 ft tall
• C. 5 years old
• D. When comfortable driving with a seat belt

Answer: (A)

The key idea is that a belt-positioning booster is used until the car seat belt fits a child properly, not based on age. When the lap belt lies low on the hips and the shoulder belt crosses the chest and shoulder (not the neck or face or abdomen), the booster has done its job. This proper fit usually happens when a child reaches about 4 feet 9 inches in height, which commonly corresponds to roughly 8–12 years old, though individual growth varies. Height is a better predictor than age for when the belt will fit correctly. The other options aren’t reliable indicators: 3 feet tall is typically too short for proper belt position; 5 years old varies widely in size and may not have proper belt fit yet; waiting until the child can drive themselves is not appropriate or safe.