Hello, anal fissures typically happen from passing hard stool. I am uncertain if yours happened directly during child birth or just during the pregnancy. Pregnancy is associated with constipation as the baby takes up space and causes increased pelvic pressure, consider taking stool softeners and drinking plenty of water and liquids to make sure you do not become constipated, as that would help avoid anal fissures. A cesarean section would avoid the possibility of ripping and tearing of the vaginal canal but as the fissure is typically from constipation, would likely not avoid that problem.