Chevrolet 1999 Express Van Owner's Manual page 52

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A rear facing infant restraint (B) positions an infant
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to face the rear of the vehicle. Rear facing infant
restraints are designed for infants of up to about
20 lbs. (9 kg) and about one year of age. This type of
restraint faces the rear so that the infant's head, neck
and body can have the support they need in a frontal
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crash. Some infant seats come in two parts the
base stays secured in the vehicle and the seat part
is removable.
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