Safety Belt Extender; Child Restraints; Older Children - GMC 2007 Yukon Denali Owner's Manual

Safety Belt Extender

If the vehicle's safety belt will fasten around you,
you should use it.
But if a safety belt is not long enough, your dealer
will order you an extender. When you go in to
order it, take the heaviest coat you will wear, so
the extender will be long enough for you. To help
avoid personal injury, do not let someone else
use it, and use it only for the seat it is made to fit.
The extender has been designed for adults.
Never use it for securing child seats. To wear it,
just attach it to the regular safety belt. For more
information see the instruction sheet that comes
with the extender.
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Child Restraints

Older Children

Older children who have outgrown booster seats
should wear the vehicle's safety belts.
If you have the choice, a child should sit in a seat
that has a lap-shoulder belt and get the additional
restraint a shoulder belt can provide.