What are the weight and height limits for using the Graco car seat with the built-in harness?

Your child must weigh between 20 to 40 lbs (9 to 18 kg) and measure between 27 to 43 inches (69 to 109 cm) in height. Your child must be at least one year old and able to sit upright unassisted, with shoulders below the top harness slots. (Page 10)