Where should the harness straps be positioned when using the car seat rear-facing?
The harness straps should be positioned at or just below the child's shoulders when rear-facing, specifically 1 inch (2.5 cm) below the headrest adjustment lever. The top of the child's ears should be below the headrest. Ensure fingers slide off harness straps without pinching to confirm proper tightness. (Page 2)
From the official Graco 4Ever DLX 4-in-1 Car Seat manual, page 2
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