Britax MARATHON User Manual page 24

 dOuble check eveRy TIMe yOu use
Double Check Car Seat-to-Vehicle Installation:
 Check that the LATCH or vehicle seat belt connections to the
vehicle are tight and secure.
 Verify the car seat cannot be moved front-to-back or side-to-side
more than one inch at the belt path.
Double Check Child-to-Car Seat Installation:
 Tug on the buckle to ensure a proper connection.
 Confirm that the harness straps are snug and over both shoulders
and hips. You should not be able to pinch excess harness strap
webbing at the child's shoulder.
 Make sure the chest clip is properly fastened and positioned in
the middle of the child's chest at armpit level.
IMPORTANT:
ThIs cAR seAT.
Britax Child Safety, Inc.
13501 South Ridge Drive
Charlotte, NC 28273
USA
A Britax Childcare Group Limited
company
Tel 1.888.427.4829
Britax USA.com