What are the weight and height limits for the Graco booster seat with back support?

For use with back support (approximately 3 to 10 years old), your child must weigh between 30 and 100 lbs (13.6 and 45 kg) and be between 38 and 57 inches (96 and 145 cm) in height. Additionally, the shoulder belt must lay across the child's shoulders in the red zone, the lap portion must be positioned low on the child's hips, and the child's ears must be below the top of the booster seat.