Oldsmobile 1999 Bravada - Manual (Page 47)

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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 lap
- only belts; however,
booster seats without shields use lap - shoulder belts.
Booster seats can also help a child to see out
the window.