Chicco KeyFit 30 Mode D'emploi page 72

SECURING CHILD WITH HARNESS
Pull excess strap up through buckle tongues so that harness is snug around
child's thighs.
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Tighten the harness by pulling slowly on Harness Adjuster Strap while
pulling up on both shoulder straps to remove all slack from below (8a).
Make sure the Harness Straps are snug on child. If you can pinch a fold in
the Harness Strap at the child's shoulders, harness is too loose (8b). If the
Harness Straps are too loose pull the Harness Adjuster Strap more.
Move the Shoulder Pads up to the child's shoulders. Slide Chest Clip up to
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center of child's chest, level with the armpits.
WARNING - If harness is not snug around your child, child could be ejected
in a sharp turn, sudden stop or crash resulting in serious injury or death.
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