Chicco KeyFit 30 Mode D'emploi page 62

ADJUSTING HARNESS HEIGHT
With child seated correctly in the Carrier, resting against back and bottom
1
of carrier and not slouched, locate the Harness Strap Adjustment Slot
closest to AT or JUST BELOW top of child's shoulders.
2
Remove your child from the carrier and loosen the Harness Straps. Turn
the Carrier over and locate the splitter plate. Unhook one Harness Strap
from the Splitter Plate.
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