He has learned to crawl. Mostly it's an army crawl, but he is starting to crawl with his belly off the floor, too.
He started waving. It's the cute, palm-toward-himself wave that babies do.
He will raise both of his hands into the air if you say, "SO BIG!"
He claps when you clap.
It's all so sweet. I can't believe how big he is getting.