GMC 1994 Yukon Owner's Manual page 44

I
A
CAUTION:
Smaller children and babies should always be restrained in a
child or infant restraint. The instructions for the restraint will
say whether it is the right type and size for your child. A very
young child's hip bones are so small that
a
regular belt might
not stay low on the hips, as it should. Instead, the belt will likely
be over the child's abdomen. In a crash the belt would apply
force right on the child's abdomen, which could cause serious or
fatal injuries. So, be sure that any child small enough for one is I
always properly restrained in a child
or
infant restraint.
I
1-32