I also found my DD had turned 90 deg in her cot one day when she was not even 4 months. I can't explain it but there was no one else in the house to turn her! She didn't move much more than that and still didn't roll until about 6.5 months. Very cute. I find her now with teddy on the floor, socks off and on floor, cardigan unbuttoned, rugs everywhere and her upside down on her back!