What should I do if my child's shoulders are below the lowest harness position when rear-facing?
If the child's shoulders do not reach the harness straps at the lowest harness setting when rear-facing, the Seat Belt Trainer MUST be installed. The Seat Belt Trainer is only compatible with the 4Ever DLX Grad car seat and must not be used with any other car seat. (Pages 1, 65)
From the official Graco 4Ever DLX Grad Car Seat manual, page 65
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