Ford Mercury Villager 1997 Owner's Manual page 172

Built-In Child Seats (If equipped)
The optional second row bench seat includes two built-in child
seats. These child restraints are to be used only by children who:
are at least one year old
AND
weigh between 10 and 27 kilograms (22 and 60 pounds)
AND
whose shoulders are below the shoulder harness slots
Children not meeting these requirements should be restrained
in an approved aftermarket child safety seat. Follow the specific
manufacturer's instructions for weight and height restrictions.
Children must be properly buckled before riding in the vehicle. It
is the law in every state and province. These child seats
conform to all Federal/Canadian motor vehicle safety standards.
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