FORD 2007 Expedition v.3 - Manual (Page 205)

Children and booster seats vary widely in size and shape. Choose a
booster that keeps the lap belt low and snug across the hips, never up
across the stomach, and lets you adjust the shoulder belt to cross the
chest and rest snugly near the center of the shoulder. The drawings
below compare the ideal fit (center) to a shoulder belt uncomfortably
close to the neck and a shoulder belt that could slip off the shoulder.
If the booster seat slides on the vehicle seat, placing a rubberized mesh
sold as shelf or carpet liner under the booster seat may improve this
condition.
The importance of shoulder belts
Using a booster without a shoulder belt increases the risk of a child’s
head hitting a hard surface in a collision. For this reason, you should
never use a booster seat with a lap belt only. It is best to use a booster
seat with lap/shoulder belts in the back seat- the safest place for children
to ride.
Move a child to a different seating location if the shoulder belt
does not stay positioned on the shoulder during use.
Follow all instructions provided by the manufacturer of the
booster seat.
Never put the shoulder belt under a child’s arm or behind the
back because it eliminates the protection for the upper part of
the body and may increase the risk of injury or death in a collision.
2007 Expedition (exd)
Owners Guide (post-2002-fmt)
USA (fus)
Seating and Safety Restraints
205