We live in a bi-level house and never used a gate. It is almost a full flight of (carpeted) stairs down to the basement (with carpeting at the bottom) and a half flight from the upstairs (beds and bath) to the main floor (living, kitchen, dining). He definitely fell down the stairs sometimes, but he also learned NOT to play on them quickly. And, as I said, the carpeting made a difference. If they had been wood, or a cement floor, it might have been another story. I don't know when we would have stopped using a baby gate, but by 16 months, I know my son was working on walking down the stairs--not crawling, not on his belly, not on his butt--walking, with no assistance--down the stairs. (He later bit it on our front stoop, and regressed a lot...) For us, the frustration of having to go over a gate constantly to get to his room (changing table) and the only bathroom was NOT worth the gate, and it was a short period of time that we were worried about him truly falling. He started walking just prior to 11 months. For us, I'd do it that way again--we have an open stairway and it would have totally ruined our woodwork to attach a gate, and the pressure mounted ones not only didn't fit right, but when we bought one for his room, it didn't keep him out either (he learned to lean against it and push it out). I'm sure this isn't most people's approach, but our son is quite confident physically, and he really needed to learn fast to get around our house--trial and error was the fastest way.