Henry is on the move

Henry is pulling himself all around the floor-can't call it crawling yet. When I come into the room he has moved himself somewhere new most every time. He is trying really hard to pull up, but not quite there. Yesterday, we had to move his crib mattress down a level because he can get himself into sitting position and then tries to pull up. Henry is very happy that he can now go get the toys that he wants (Harrison's toys) instead of having to stay in one place playing with his toys.