Hi I have 15 month old DS who from the age of about 3 months has always slept (brilliantly) in grobags of varying size and thickness. He still does. I have used them for both daytime naps and night time. But should I be thinking about geting a proper duvet/pillow for his cot bed now? No real concerns about continuing with grobags as he sleeps so well, just a comment from a colleague has prompted the question!