Ford Mercury Villager 1997 Owner's Manual page 170

Safety Belts for Children
Children who are too large for child safety seats should always
wear safety belts. (See instructions with your child seat, or contact
its manufacturer, to determine maximum size of a child that
will fit safely in the safety seat.)
If safety belts are not properly worn and adjusted as
described, the risk of serious injury to the child in a
collision will be much greater.
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WARNING