GMC SIERRA 1995 Manual page 58

Accident statistics show that children are safer if they are restrained in the
rear seat. But they need
to use the
safety belts properly.
Children who aren't buckled up can be thrown out in a crash.
Children who aren't buckled up can strike other people who are.
~
A
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:
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. 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.
1-42