Chicco KeyFit 30 User Manual page 19

Some vehicles have no seating positions which are compatible with this Child
Restraint. If in doubt, contact the vehicle manufacturer for assistance. Only
forward-facing vehicle seats can be used with this Child Restraint.
Make sure no more than 4 inches of the
Child Restraint base is past the edge of
the vehicle seat.
VEHICLE SEATING POSITIONS
Do not use on a folded down
vehicle seat back.
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