Around the age of 4 years, many children will outgrow their forward-harnessed car seats. Both the American Academy of Pediatrics and the National Highway Traffic Safety Administration recommend that a child whose weight or height is above the limit for a forward-facing car seat should use a belt-positioning booster seat until the vehicle seat belt fits properly, typically when the child has reached 4 feet 9 inches in height and is aged 8 to 12 years.A child who is aged between 4 and 8 years is not large enough to be seated safely in a vehicle using just the vehicle seat belt. "Boosting" a child correctly positions the shoulder and lap belts, providing excellent protection in a crash.
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