Dude, it's nuts. Aaron will tell you the same thing, but it goes by SO fast! 16 months later, and I find myself wishing he was small again. It does. Arthur really has a personality of his own and is developing a very strong will. I often wish he was still little and easy to carry, but now we are in this stage of another real human that interacts with us in every aspect. The dynamic of the house changes nearly every few months. Really. We went from potty training to now hand writing and math. Those two, he is a little ahead of normal as I have been working with him daily. But yes, as my F-I-L keeps stressing, enjoy every stage they go through as they will be off to college before you know it.