To give you a frame of reference, my 3 year old is just shy of 4 feet tall (the size of their cages), 50 pounds, talks a mile a minute, he's reading a little bit, is pretty good at basic addition and subtraction, and it breaks his heart if he makes me lunch and I don't sit down to eat with him right away. He has a killer broom-stick speed bench, likes to play his violin (even though it sounds awful for now), he's been potty trained for a year and a half, and starts kindergarten next week.