Landon's big accomplishment

I would not believe it if I hadn't been there but here's what happened. Last night we were getting ready to leave the house and I had to change both babies well Landon was crying so I put him in his crib while I changed Sienna. Landon is less fussy when he is on his tummy so he was on his tummy but still pretty upset the next thing I knew he was completely quiet I turned around and he had rolled over and was staring up at me like what did I do. He must have either felt a lot better or been confused because he didn't make a peep for 2 hours which is very unlike him. I have no idea when babies are supposed to roll over but I am just not ready for him to be any kind of mobile. So now we really have to watch him. I am keeping my camera handy now hoping to catch him in the act.