And over 1 year Over 40 lbs. Up to about 80 lbs. Children to at least one year and at least 20 lbs. Harness straps at or below shoulder level. Harness straps should be at or above shoulders.
Most seats require top slot for forward.
Belt positioning booster seats must be used with both lap and shoulder belt. Make sure the lap belt fits low and tight to avoid abdominal injuries.