with internal harness The term child restraint system with internal harness means a child restraint system designed to be used rear-facing or forward-facing employing a 5-point harness to position the child in the seat. (5) Combination car seat The term combination car seat — (A) means any child restraint system designed to be used in a forward-facing position with a 5-point internal harness, where the harness may be removed and the seat utilized as a belt-positioning booster seat