Hi Pickle, My daughter is 2.5 and still in her cot, I do worry that she is one of the last still to be in a cot but my reasons are; it is a large cot bed, she has more than enough room, she is the worlds biggest fidget and ends up all over the cot! She wakes in the night to go to the toilet, she also didn't sleep through until she was just over 2 years old, and was a nightmare to actually settle to sleep. I know that if she were in a bed this would be a step backwards for us - in that she would not settle if she had the option to escape! I understand your dilemma completely but think that if he's happy in his cot, and you're not fussed, go with it! I'm pretty sure it won't cause them any long lasting damage! V