Heath is just starting to pull up and stand but has shown no interest in climbing. Well today he was playing in his crib - the side of which is about forehead high on him - and the wife and I were doing other things around the house. And we heard a terrible thump followed by a blood curdling scream. A mad sprint into his room found him on the floor under his crib. NO injuries, but it is time to lower his mattress. Little monster nearly gave me a heart attack.