Chevrolet 1999 Cavalier Owner's Manual page 51

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A booster seat (F, G) is designed for children who
are about 40 to 60 lbs., or even up to 80 lbs.
(18 to 27 kg, or even up to 36 kg), and about
four to eight years of age. A booster seat is
designed to improve the fit of the vehicle's safety
belt system. Booster seats with shields use
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lap only belts; however, booster seats without
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shields use lap shoulder belts. Booster seats
can also help a child to see out the window.
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