Chevrolet 2003 Monte Carlo Owner's Manual page 39

People should never hold a baby in their arms
while riding in a vehicle. A baby doesn't 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. (1 10 kg) force on a person's
arms. A baby should be secured in an
appropriate restraint.
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