I started a thread called 'Rolling escaping baby' and was having the same trouble as you are with Gemma. In the end we didn't worry about it and have only just put up the side of the cot (Amy will be 6 mths old next week). You may want to check it out as some of the girls had some good advice. Amy has been in a Grobag since we stopped wrapping her about 10 weeks and it doesn't really matter where they go in the cot because they are always covered. Good luck!