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A harnessed seat has an internal 5-point harness system to restrain the child, whereas a booster seat “boosts” the child up so that the vehicle seat belt is positioned correctly across the child’s hips and shoulder/middle of the chest.
The minimum requirement is set to avoid promoting forward-facing too early. It’s recommended to transition from an infant car seat to a rear-facing convertible car seat before using a harness-2-booster.
Your child must weigh at least 40 lbs, at least 44” tall, and be mature enough to sit still and upright for the whole ride. Check your car seat manual for any additional requirements.
Best practice states that children are usually ready for belt-positioning booster mode when they outgrow the height or weight limit of their forward-facing harness—typically around 65 lbs or 49 inches tall.
In booster mode, the vehicle seat belt restrains the child, and the LATCH system provides stability to the seat. The LATCH does not bear the crash forces, so it does not contradict the vehicle manufacturer’s maximum anchor weight limit.
No, the seat should not be reclined in booster mode as it was tested and certified for use only in the upright position.