Pontiac 1997 Grand Prix Owner's Manual page 70

Here a child is sitting in a seat that has a
lap-shoulder belt, but the shoulder part is behind
the child.
If
the child
wears
the belt
in
this way, in
a
crash the child might slide under the belt. The
belt's force would then be applied right on the
child's abdomen. That could cause serious or
fatal injuries.
Wherever the child sits, the lap portion of the belt
should be worn low and snug on the hips, just touching
the child's thighs. This applies belt force to the child's
pelvic bones in a crash.
1-62