My son fell down the stairs at about 22 months too. I am in a trilevel and on the main floor he was upstairs , got to the steps and tumbled. I totally freaked out. Ran to get him he was about 22 mo at the time. I was screaming oh no oh no. Yes I cried too... did he... of course not did not even phase him.
Well not long after that he purposely would go down the stairs and go oh oh no no. Laughing at me each time!!
I know I felt guilty for a long time oh what could have happened. So be careful and pray ALOT!!
My 20 month daughter now goes up and down stairs on her own she sees her brothers sliding down and tries to do it too. Its like a big joke on me for them to make ME think they are falling!!! Good Luck!! :)