Mother's Day Mania at Mama M's - Whoopsie Wednesday

Wednesday: Whoopsie Wednesday! Let's kick this off with a little support therapy! Nearly every mom I know, had a "whoopsie" with at least one (all?) of their kiddos...falling off the bed, bonking a little head going around the corner, a bent toe in a shoe...I've heard so many stories! And, I know we ALL feel horrible about those times, so let's share 'em!



Almost didn't want to participate in this one because the first story that came into my mind makes me feel like a horrible mother, but maybe I can get advice from you guys.

We were staying a friend's house who had lots of stairs. Our house has 2 mini half stairs. My almost 16 mo. old son at the time went slowly up the stairs and I waited for him at the top. He stopped at the midway landing and I told him to keep coming, but then he started to lose his balance. I started running down the stairs, but it was too late he fell down half a flight of stairs. My heart was pounding so badly and didn't want to stop. He cried for a few moments, but went right back up the stairs. I figured he must have been okay since he didn't cry long. Am I horrible mom?! I still feel horrible about it. I should have stayed closer to him. He's really great at climbing stairs and we practiced all day climbing down those stairs since he doesn't know how to climb down stairs since we don't have any big ones to practice on at our house. Should I have had him checked out? I'm paranoid now that he's messed up his brain or something.
How old would you wait until you trusted your child with stairs without supervision?