Ange: Attachment style is both environmental and hereditary. She says there isn't any behaviour that you would say is entirely from your environment. Some children come into the world with a set of jeans that predisposes them more toward one kind of attachment style or the other. Ange: The continuity of your attachment style to how you are now is one of the predictions that john bolby had, that your attachment style that you develop wh yo are really young is the one that you keep for life.