GMC C series 2002 Owner's Manual page 33

CAUTION:
The body structure of a young child is quite
unlike that of an adult or older child, for whom
the safety belts are designed. A young child's hip
bones are still so small that the vehicle's regular
safety belt may not remain low on the hip bones,
as it should. Instead, it may settle up around the
child's abdomen. In a crash, the belt would apply
force on a body area that's unprotected by any
bony structure. This alone could cause serious or
fatal injuries. Young children always should be
secured in appropriate child restraints.
1-26
We know securing a child can present real problems in a
-
medium duty vehicle like yours. The only place where
you can properly secure a child restraint is the center
seating position, the place that has the lap belt only.
But your vehicle may not have a center seating position.
Or, even if you have one, you may find that the child
restraint keeps you from operating the shift lever or
other controls. The only answer may be to have the
smaller children make the trip in another vehicle,
where they can get the protection they need.