How do I check if the harness is tight enough on my child?
The harness is tight enough when you are not able to pinch any of the harness webbing at your child's shoulder. A snug harness should not allow any slack, should lie in a relatively straight line without sagging, and should not press on the child's flesh or push the child's body into an unnatural position. (Page 64)
From the official Graco Graco Nautilus 65 Manual Booster Seat User manual, page 64
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