When we moved Libby we did the whole hog, she went from being in her cot with a sleeping bag to going in a bed with no sides and a pillow & quilt
She was such a wriggle bum though and did fall out a few times in the first couple of weeks (she didn't cry though so it can't have hurt her
) and she has gotten herself in some funny strange positions (I think you saw the pic of her sleeping while half standing up
).
Edited to say that we use a normal single quilt as it's easier and cheaper to buy covers for, we just tuck the excess under the mattress. xx