What are the weight, height, and age requirements for using the Maestro Sport in 5-point harness mode?

The child must weigh between 10 to 22.6 kg (22 to 50 lbs), measure 71 to 127 cm (28 to 50 in.) in height, and be at least 2 years old. Additionally, the tops of the child's ears must be at or below the top of the child restraint headrest. Once the child exceeds any of these requirements, you must discontinue use of the internal harness. (Page 4)