Just Sitting and Playing

I can pretty much sit on my own these days. If I sat still, I could sit all day long, but sometimes I get too excited and start rocking and I fall right over. I don't understand how to get up once I fall. Sometimes I fall back, which is ok because I have that pillow to lay on. Other times I fall to the side and slowly roll onto my tummy. And there are other times when I lean forward too much and do a nose dive. Here is a video of me sitting and playing. Notice I don't fall at all!! I'm getting so good at this!