Pontiac 2004 Sunfire Owner's Manual page 37

CAUTION:
{
Never do this.
Here two children are wearing the same belt.
The belt can't properly spread the impact
forces. In a crash, the two children can be
crushed together and seriously injured. A belt
must be used by only one person at a time.
Q:
What if a child is wearing a lap-shoulder belt,
but the child is so small that the shoulder belt
is very close to the child's face or neck?
A:
If the child is sitting in a seat next to a window, move
the child toward the center of the vehicle. If the child
is sitting in the center rear seat passenger position,
move the child toward the safety belt buckle. In
either case, be sure that the shoulder belt still is on
the child's shoulder, so that in a crash the child's
upper body would have the restraint that belts
provide. If the child is so small that the shoulder belt
is still very close to the child's face or neck, you
might want to place the child in a seat that has a lap
belt, if your vehicle has one.
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