Ford 2009 Flex Owner's Manual page 217

Seating and Safety Restraints
4. Rotate the tether strap clip.
5. Tighten the child safety seat
tether strap according to the
manufacturer's instructions.
If the safety seat is not anchored properly, the risk of a child being
injured in a collision greatly increases.
Child booster seats
The belt-positioning booster (booster seat) is used to improve the fit of
the vehicle safety belt. Children outgrow a typical child seat (e.g.,
convertible or toddler seat) when they weigh about 40 lb (18 kg) and are
around four (4) years of age. Consult your child safety seat owner guide
for the weight, height, and age limits specific to your child safety seat.
Keep your child in the child safety seat if it properly fits the child,
remains appropriate for their weight, height and age AND if properly
secured to the vehicle.
Although the lap/shoulder belt will provide some protection, children
who have outgrown a typical child seat are still too small for lap/shoulder
belts to fit properly, and wearing an improperly fitted vehicle safety belt
could increase the risk of serious injury in a crash. To improve the fit of
both the lap and shoulder belt on children who have outgrown child
safety seats, Ford Motor Company recommends use of a belt-positioning
booster.
217
2009 Flex (471)
Owners Guide, 2nd Printing
USA (fus)