Graco FastAction Fold Owner's Manual page 34

Does Your Seat Fit Your Child Correctly?
To make sure your child is secured properly, review section 4 to
understand all of the actions you need to take to properly adjust the
car seat to fit your child.
Harness Height
Harness straps at or just below the
child's shoulders. Review section 4-A.
Buckle Position
The correct slot is the one that is closest
to your child without being underneath
them. Review section 4-B.
Harness Tightness
If your fingers slide off the harness straps
without pinching the straps, it is tight
enough. Review section 4-C.
You Need To Adjust:
6