Tamsin can sit up by herself! She's still a little wobbly and tips over, but she can sit up without anyone holding her for a short time! She's also really wants to crawl. She's tries so hard - she pushes all the way up with her arms, but her legs don't quite move like they should and she can't get traction. She practices for awhile and then we have to rescue her because she gets so frustrated. I don't think it will be long before she gets it!
Here's Tamsin sitting up today: