Never do this.; Here a child is sitting in a seat that has a; shoulder belt, but the shoulder part is behind- Page 63

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CAUTION:

Never do this.

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.