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  OMG, I'm freaking out just looking at that picture!!!
 We have a stairway to the lower level like that, and yes mine do the same thing every so often.  Scares me to death.  I've been trying to find something to use; Walmart online has something that is actually made for that purpose to keep toddlers safe, but I think the previous posters' idea of door screen material is a much less obvious way of solving the problem.  I might just have to go get some today.
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