DS (4.5 months) has used a dummy to get himself to sleep for the last couple of months. I'm keen to wean him off it at some point fairly soon, but don't really know how to go about it. Without the dummy he finds it impossible to calm down - he just kicks and wriggles and waves his hands in the air (as well as crying). Does anyone have any tips on how/when best to wean him off it, or is it just a case of going cold turkey?