There are a lot of tangible milestones that your child reaches as they grow. First steps. First words. First visit with a probation officer. You could build a scrapbook around just these things and have a wonderful document of your child's early years. But, what about the less tangible things? The things that kind of sneak up on you when you're not looking and just become a part of who your child is?
I might have mentioned it before, but Chunk is the world's greatest Superman fan. His little plastic Superman, which is carried with him everywhere, is so "loved" that Chunk has managed to wear off the paint on his head, giving Superman something like male pattern baldness, as well as a disturbing amount of wear on his elbows, knees and chest, that make him look more Man of Leprosy than Man of Steel. Of course, in that great way that children are, Chunk doesn't mind a bit. All he cares about is that he has his Superman with him and he has parents that are willing to listen to his explanations that Superman can "fly fast!" over and over again, complete with "sonic-boom" style sound effects.
His status as a Superfan is just one of those things that have snuck up on us. It's just one of those things that you accept, because it just becomes a part of your child's personality.
Another thing that has just become a part of Chunk, coincidentally related to his love of Superman, is his constant use of self-generated theme music. I should explain that one. Every time Chunk takes off his coat, and I mean every time, he rips it off like he has a big, yellow S on underneath it. And, with an equally dramatic flourish, he yells "da-daaaa-daaah!" And, any spare scrap of fabric he can find is instantly labeled a cape, which he then uses to fly around the room, "fast!"
What about your child? What little things have they started to do that have just become a part of their personality?