My baby is now 3 months old and we've just moved her out of our room and into her own room and cot. She's sleeping well but over night she wriggles up out of the tucked in blanket and gets chilly! Has anyone tried a baby sleeping bag?? are they safe/any good? I'm a bit concerned about her over heating in a sleeping bag? (wasn't sure where to post this so sorry if it's in the wrong bit).