B stacked blocks today on his own. We were in his room and I looked over and there he was putting one block on top if the other. It was surprising to him that he did it. So he kept doing it by taking the block and stretching his arm as far as he could with a block and then bringing it back to set atop the other block. He took a moment each time to be amused and impressed with his new skill. It was so awesome, he even let out a tiny chuckle when he did. You can see his face in the images below.
