I would make each baby their own quilt. I had a stillborn twin and a strong, healthy one. While I wanted people to acknowledge J's existence, I don't think I would have wanted a constant visual reminder. If you make separate quilts the family can choose whether to store or display the deceased twin's quilt and still know you cared. Then the survivor can have his own. I did not tell my son until he was a teenager that he had a brother. He was glad as he said he always felt as he something was missing, but I'm glad I waited. I think it would it have been a lot for a young one to handle.