He Stood!

I was watching Mark pull himself up against a cardboard box. Then, he let go of his grip, and briefly stood for about a second before he started falling over forwards. I thought he was going to fall on his face, but he landed in a crawling position and came across the room with a big smile on his face.

It was a bit unsteady, but it's the first time I've seen him attempt to stand with no hand support.

Way to go, Mark!