What is the difference between rear-facing and forward-facing installation?
Rear-facing mode is for children 4-40 lbs (1.8-18 kg) and uses the bottom 3 harness height positions with harness straps below shoulders. Forward-facing mode is for children 20-65 lbs (9-30 kg) and uses the top 4 harness height positions with straps at or above shoulders. The tether should only be used in forward-facing mode.
From the official Graco All One Car Seat manual, page 18
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