The boys are definitely becoming more and more independent. I love watching them reach new milestones but hate to see them grow up so fast! The boys are sitting up unassisted but only for a few minutes or moments at a time (depending on the distractions) before toppling over. We have been working hard to build those back and neck muscles and have even set up a "sitting station" surrounded by pillows so they can practice their new feat.
Carter is pretty much a mover and groover and I think he'd rather crawl than ever learning how to sit! I don't think it'll be too much longer before he figures it all out...