Pontiac 2007 Solstice Owner's Manual page 28

CAUTION:
{
Never do this.
Here two children are wearing the same
belt. The belt can not 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.
28
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
that belts provide.