Britax BOULEVARD 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 (2.5 cm) 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.