Buick 2003 Century Owner's Manual page 45

A booster seat (F-G) is a child restraint designed to
improve the fit of the vehicle's safety belt system. Some
booster seats have a shoulder belt positioner, and
some high-back booster seats have a five-point
harness. A booster seat can also help a child to see
out the window.
Q:
How do child restraints work?
A:
A child restraint system is any device designed for
use in a motor vehicle to restrain, seat, or position
children. A built-in child restraint system is a
permanent part of the motor vehicle. An add-on child
restraint system is a portable one, which is
purchased by the vehicle's owner.
For many years, add-on child restraints have used
the adult belt system in the vehicle. To help reduce
the chance of injury, the child also has to be secured
within the restraint. The vehicle's belt system secures
the add-on child restraint in the vehicle, and the
add-on child restraint's harness system holds the
child in place within the restraint.
One system, the three-point harness, has straps that
come down over each of the infant's shoulders and
buckle together at the crotch. The five-point harness
system has two shoulder straps, two hip straps and
crotch strap. A shield may take the place of hip
straps. A T-shaped shield has shoulder straps that
are attached to a flat pad which rests low against the
child's body. A shelf- or armrest-type shield has
straps that are attached to a wide, shelf-like shield
that swings up or to the side.
When choosing a child restraint, be sure the child
restraint is designed to be used in a vehicle. If it is, it will
have a label saying that it meets federal motor vehicle
safety standards.
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