Graco 8J00MTX - Nautilus 3- In 1 Toddler Car Seat Owner's Manual page 30

11. Check that the straps are inserted at the
same level. Pull on harness to make sure it is
secure .
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13
REMEMBER to check the shoulder straps and
crotch strap position as your child grows and
move them to the next position when
necessary. The harness straps must go in the
slots even with or just above the shoulders.
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