From a women's point of view, pregnancy is the real essence of her life but accordingly is brings some drastic changes in her body & affects several body components. The vagina considered as most spongy or muscular or elastic organs of women's bodies average about 4-5 liches, long adult women. During childbirth, the baby passes through the birth canal which has a huge amount of pressure rest of the muscles also called pelvic floor muscles which responsible for providing strong support to pelvis organs & sub organs. The strength of the vaginal relies on pelvic floor muscles & during vaginal delivery, the pelvic muscles become slightly loose which leads vaginal laxity. Source: https://myeveschoice.com/