Oldsmobile 1999 Alero - Manual (Page 52)

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3. Buckle the belt. Make sure the release button is
positioned so you would be able to unbuckle the
safety belt quickly if you ever had to.
4. To tighten the belt, pull up on the shoulder belt while
you push down on the child restraint. If you’re using
a forward
- facing child restraint, you may find it
helpful to use your knee to push down on the child
restraint as you tighten the belt.
5. Push and pull the child restraint in different
directions to be sure it is secure.