He's been sitting up mostly unassisted for about a week or two, but we usually have to put him into the position (and then he'll mostly hold it). Last week he started pushing himself into a tripod from being on his hands and knees, and then yesterday I glanced at him in his crib on the video monitor and he was sitting up straight, on his own! It was even more exciting when he did it for me and DH last night...it feels like such a small thing, but it's so exciting to watch him learn and master things!

When did your LO sit up on their own?