DS is 7 and about 48 inches and 48 pounds. He has a Nautilus and he is still in the 5 point harness. If I remember correctly the Nautilus converts to a booster seat. When should we move him to the booster? He isn't really complaining about the seat but I know none of his friends are still harnessed.
Also, Is the Nautilus a good booster seat or should we consider something else if we move him?