Climbing out the crib

So...my 7 month old was put in the crib while I was going to go to the bathroom. But then he grabbed the bars and pulled himself up and tried to get out. Now what? Lol where do I put him for safety? He can't crawl yet just gets on all 4's. Didn't think this day would come so soon. I wish I had bought one of those cribs where the back is higher because I'd just turn that part forward. I am not ready lol