Chevrolet 1998 Express Van Owner's Manual page 52

Never hold a baby in your arms while riding in a
vehicle.
A
baby doesn't weigh much
--
until a
crash. During a crash a baby
will become so
heavy you can't hold it. For example, in a crash
at only 25 mph (40 km/h), a 12-1b. (5.5 kg) baby
will suddenly become a 240-1b. (110 kg) force on
your arms. The baby would be almost impossible
to hold.
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