Well, okay. I wouldn't necessarily call it walking at this stage, as he is only able to take about 5-6 steps at time before he falls on his butt or catapults himself to the floor.
Nevertheless, just look at the progress he's made in a few short days...
Saturday, Aug 3rd (My good friend Christine has pointed out that I often make a "Cartman-type" voice when I am talking to Miles):