Chevrolet TRACKER 2003 Manual page 38

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
becrushed together and seriously injured.
A belt must be used by only one person at
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:
Move the child toward the center of the vehicle, but
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 the belt provides. 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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