The little guy randomly climbed up a stair in MI. He's honestly never been near stairs, so we didn't know what he could or couldn't do. I gave him some space to see what would happen ... And he climbed the whole flight! He did stop twice to stand up and jump like a monkey on the banister, so if I wasn't there as backup there would have likely been a nasty tumble. However, those stairs came a little too easy for him :(