I vaguely remember teaching Kira how to go up and down stairs. We didn't have stairs at our house (we still don't have any inside the apartment) and I remember putting Kira on the bottom of some stairs one day and she just started climbing and climbing until she was at the top. She never had any interest in coming down.
Hayden is starting to be fascinated with stairs. The problem is he figured out how to climb down stairs - head first. That's not a good way to go down for babies but he doesn't get it. Ever since he climbed down these two steps, he's been trying to beat us to the door and head down our super steep stairs leading up to the apartment. He is definitely giving me a run for my $$.