What are the weight and height limits for the Graco Slimfit 3-in-1 car seat in each mode?

The Graco Slimfit 3-in-1 has three weight ranges depending on the mode: rear-facing harness mode is for children weighing 5-40 lb (2.2-18 kg), forward-facing harness mode is for children weighing 26.5-65 lb (12-29.5 kg), and highback booster mode is for children weighing 40-100 lb (18-45 kg). Always ensure your child meets the weight requirements for the mode you are using.