My dear Brenna has been able to sit up for about a month now. The thing is, she would only do it in her crib. I finally managed to see her do it this week, but for a month I would go in and find her sitting up playing. One day, I found her like this after a nap and thought it was the cutest thing! We'll be lowering the crib now, because she's figured out how to pull up and stand as well!
(Look at those fat little legs!! My other two didn't get pudgy little legs, so I'm loving this!)