My sass is quickly becoming a pro at sitting - tho now I'm paranoid that she won't learn to crawl bc she hates not sitting. You lay her on the floor and she rolls around whining and trying to sit up. Sit her up and she'll play contentedly with her toys.
Here's Javi acting as her pillow for the times when she gets tickled and throws herself backward.
And here's Sassette herself mugging for the camera: