What is the right age to introduce baby comforters to help babies settle down?

Any item introduced before 6 months of age must be made from a breathable fabric, such as the Cuski or made from muslin. If using a comforter under 6 months of age, we recommend attaching it to your baby's swaddle or sleeping bag with a safety-lock safety pin, so it can't get up over their face. If you are introducing one after that time, then any small, breathable comforter should be fine provided it has no loose stitching or any small pieces that can become unattached. http://www.thesleepstore.com.au/sleep-information/infant-sleep/sleep-information/introducing-using-a-comforter