Ford Mystique Owner's Manual page 116

To improve the fit of lap and shoulder belts on children who
have outgrown child safety seats, Ford recommends use of a
belt-positioning booster seat that is labelled as conforming to all
Federal motor vehicle safety standards. Belt-positioning booster
seats raise the child and provide a shorter, firmer seating
cushion that encourages safer seating posture and better fit of
lap and shoulder belts on the child. A belt-positioning booster
should be used if the shoulder belt rests in front of the child's
face or neck, or if the lap belt does not fit snugly on both
thighs, or if the thighs are too short to let the child sit all the
way back on the seat cushion when the lower legs hang over
the edge of the seat cushion. You may wish to discuss the
specific needs of your child with your pediatrician.
Do not use a belt-positioning booster with a lap-only
belt.
Lap belts and the lap belt portion of lap and shoulder belts
should always be worn snugly and below the hips, touching the
child's thighs.
Children should always ride with the seatback in the
fully upright position.
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