Global Machinery Company Sierra 1999 - Manual (Page 53)

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A rear - facing infant restraint (B) positions an infant
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 crash. Some infant seats come in two
parts
-- the base stays secured in the vehicle and
the seat part is removable.