i woke up to the worst possible thing

my beautiful nephew, Mikey fell down some stairs. I was asleep at the time, I heard a thud, and then Mikey crying. I was stunned to see him lying on the landing bawling his eyes out. I quickly scooped him up and started soothing him, whereas eveeryone else woke up. There is 2 barriers, including a gate that has a lock and he managed to open it and try and come downstairs to see me. He's a very smart baby, and I'm just thankful he didn't fall over the side, as there is no upright poles, he could have fell between the hand rail and all the way down. He appears to be fine, just very upset. he vomited, but other than that, he seems fine. I certainly hope so. we'll have to do something about the barriers....:(