The harness or shield must be used according to the manufacturer's instructions. No more than one finger width of space should be between child's collar bone and harness. A child can be thrown out of a harness or sheild that is too loose, fits poorly, or if the harness retainer clip is placed below armpit level. A twisted or torn strap can decrease the crashworthiness of the car seat. Straps not double looped are likely to pull free in a sudden stop or crash.
Car seats work only when they are properly secured to the vehicle with the safety belt.
Please check the car seat instructions and vehicle owner's manual for securing the car seat. Some safety belts will lock only when the car crashes or driver slams on the brakes. These safety belts cannot hold a car seat tightly enough for the car seat to work properly in a crash. See car seat instructions for installation of a locking clip. Not all safety belt systems are designed to secure a car seat.