In short, the phrase "new birth" refers to a fresh start or beginning in one's life. It suggests a significant change or transformation that brings about a renewed sense of purpose or direction. Full definition
The course can help us to be fully present for a totally new birth experience — and a totally new baby! (mindfulbirthing.org)
Most recently this approach has been perfected by Peter C. Hodgson (in New Birth of Freedom: A Theology of Bondage and Liberation [Fortress, 1976]-RRB-: (religion-online.org)
Prior to the judgment, Alberta law only allowed for new birth certificates if sex change surgery had been performed. (firstthings.com)