we used a sleeping bag when she was about 4 months or so, but when she started moving about we stopped.... i tried to re-introduce one the other week and she was furious, so frustrated... she likes to sit and talk and also stand at the side of the cot before she goes to bed, and i think the grobag frustrated her as she could'nt move about like normal.... im devastated as i have just bought two (not grobags, but cheaper ones) and also been given two actual grobags, so i am keen for her to use them.... especially cos often she feels quite cold as she sleeps with no covers at all. not sure whether to keep persisting or give up.