GMC 2001 Sierra - Manual (Page 58)

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CAUTION:
Newborn infants need complete support,
including support for the head and neck.
This is necessary because a newborn infant’s
neck is weak and its head weighs so much
compared with the rest of its body. In a crash,
an infant in a rear
- facing seat settles into the
restraint, so the crash forces can be distributed
across the strongest part of an infant’s body,
the back and shoulders. Infants always should
be secured in appropriate infant restraints.
CAUTION:
The body structure of a young child is quite
unlike that of an adult or older child, for whom
the safety belts are designed. A young child’s
hip bones are still so small that vehicle’s regular
safety belt may not remain low on the hip bones,
as it should. Instead, it may settle up around the
child’s abdomen. In a crash, the belt would apply
force on a body area that’s unprotected by any
bony structure. This alone could cause serious or
fatal injuries. Young children always should be
secured in appropriate child restraints.