By 10.5 months he was walking like a pro. A full-time walker. He very rarely crawls. He can squat down to pick up an object and then stand back up, as well as carry larger objects without falling down. He has even mastered the full turn without falling. He sits down when he wants to, and only falls (for the most part) if he bumps into something or is bumped in to, or pushed.
He is a busy busy boy. Any one who meets him says two things about him - 1. He smiles a lot. Unless he is crying, he is smiling. There is (mostly) no in between. and 2. He gets in to every thing. Which he does. Always. If there is something to be tipped, toppled, spilled, pulled, opened, eaten, climbed on etc etc, Mason is there.
Next up: climbing. He can climb steps and furniture that is low to the ground, pretty much anything that is at his waist level or lower is within his climbing ability. And and he does attempt to climb things that are taller. It's only a matter of time . . .