I can't believe he is already 6 months old. Sorry to everyone who I rolled my eyes at when you said "it goes by so fast." You were right.
I think he has felt the pressure of his old age lately because in the last week he finally decided he could roll over (although still reserved for special occasions), he has 2 teeth coming in on the bottom, and he is sitting up (albeit a little unsteady). He is very busy working on all his new laughs and sounds (gargling is his latest), sticking everything he can in his mouth, and waving his head around in the "shark attack" fashion.
I keep trying to tell him to slow down, but he doesn't seem interested. I'll keep trying.