Oscar's discovered that his fists are part of him, conveniently located at the end of his arms, which he has enough control over now to slowly and steadily move them so the fists end up in his mouth. Satisfaction!
I keep trying to get a picture of him focusing on his fists, but he almost always becomes aware of the camera before I can get a shot of the profound concentration on his face. Here's the closest I've come:
And just a happy baby shot: