When must the lumbar support be used?
Lumbar support is optional for rear-facing mode. When the seat is used in forward-facing mode with a child weighing less than 25 pounds, the lumbar support must be used. Do not use lumbar support for a child weighing more than 25 pounds in forward-facing mode.
From the official Graco 4Ever DLX Grad Car Seat manual, page 1
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