What should I do if my child is between 30 and 40 lbs and their shoulders are below the upper harness slots?
Graco highly recommends using the built-in harness for as long as it is suitable and comfortable when your child weighs between 30 and 40 lbs and their shoulders are below the upper harness slots. This provides the maximum protection for your child in this weight range. (Page 10)
From the official Graco Car Seat Seatbelt manual, page 10
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