We are at the "almost" stage for sitting up on his own. Luke has been grabbing his feet for about a week now when he sits on our laps or in the Bumbo. This must offer him some kind of stability because he is now able to sit without support for a few seconds. We are a bit nervous to move our hands away completely in case he teeters over, but unless we move our hands, I'm afraid we'll never give him the chance to sit up on his own. I'll be sure to post photos when he masters this skill.
I am amazed that this has happened so fast. In about four weeks, Luke has gone from being unable to roll over to nearly sitting up on his own. Wow! Baby development is absolutely amazing!