Chevrolet 2005 Express Van Owner's Manual page 44

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 the 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 is
unprotected by any bony structure. This alone
could cause serious or fatal injuries. Young
children always should be secured in
appropriate child restraints.
1-38
CAUTION:
{
People should never hold a baby in their
arms while riding in a vehicle. A baby does
not weigh much — until a crash. During a crash
a baby will become so heavy it is not possible
to hold it. For example, in a crash at only
25 mph (40 km/h), a 12-lb. (5.5 kg) baby will
suddenly become a 240-lb. (110 kg) force on a
person's arms.