When should I use the lumbar support in forward-facing mode?
The lumbar support MUST be used when the car seat is in forward-facing mode for a child weighing less than 25 lb. The lumbar support MUST NOT be used for a child weighing more than 25 lb in forward-facing mode. In rear-facing mode, the lumbar support is optional. (Page 123)
From the official Graco 4Ever DLX Grad Car Seat manual, page 123
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