Many women are candidates for VBACs, but there are lots of factors that influence the decision. What was the reason the initial c-section was carried out? Are those factors present during this subsequent pregnancy as well, or do they no longer apply? If the first c-section was carried out because the baby was breech, and the following baby is presenting vertex, for instance, that might make a mother an excellent candidate for a VBAC. Those who have a bicornuate (heart-shaped) uterus are much less suitable for a vaginal birth after c-section. The main argument in favor of a repeat cesarean section is the risk of uterine rupture. The uterus can rupture where the incision was made, which can become a life-threatening emergency for both mother and baby.
While a RCS eliminates this risk, a c-section is still major surgery that carries risks as well, and it is up to individuals and their doctors to make that call. The likelihood of a uterine rupture is much higher if the c-section incision was classical, meaning vertical, rather than the horizontal incision that is most commonly made these days, so the incision type, as well as the type of sutures a woman got at her c-section should also be taken into account. Also look at is "too posh to push" a myth?