Vaginal birth, also known as natural birth, is the process of delivering a baby through the mother's birth canal. There are several synonyms for vaginal birth, including normal delivery, physiological birth, uncomplicated delivery, spontaneous delivery, and unassisted birth. These terms are often used by healthcare providers and childbirth educators to describe the natural process of giving birth without the use of interventions such as epidurals or cesarean sections. It is important to note that while vaginal birth is a common and natural method of giving birth, it may not be possible or safe for all women and their babies, and medical interventions may be necessary.