Hun, I'm sorry this happened to your DD, but like pretty much everyone else have said, it does happen! Just the other day my 11 month old rolly polly (just started commando crawling a few days ago) almost rolled off the bed. Now, I wasn't in the toilet or anywhere else, I was on the bed with him and he was quick as lighting and did 3 rolls all at once and if I didn't grab him by the clothes on his chest he would have fallen off. Now, this is for the mother of the year award......I was in China in November last year so DS was 8 months old and I tripped on the pavement while holding DS and I fell with all my weight forward and DS hit his head on the concrete. Luckily the arm that was holding him protected him somewhat, but I still heard the thud and my heart stopped. He cried straight away for only a minute, but there was never a bump there, just a red spot. I watched him all that day and he seemed happy enough, but I kick myself now for not taking him to the doc just so he/she could check him over. My DF said he looked fine so probably was fine. I still think about it and wonder if I didn't cause any damage inside. He has been noramal after wards, so I try not to worry too much. Big hugs hun and give your little one a hug xxx