From what I remember, babies are often born "the regular way" in the book, but a good number of women choose Cesarian Section for delivery. Unlike in our society, where Cesarian birth is thought of a medical necessity for certain situations, the women in the book seem to choose it as a way to avoid the unpleasantness of giving birth.
Most people in the book, and women in this instance, are incredibly self-centered. They tend to do those things that provide the most pleasure and avoid unpleasant things, even at the expense of others. Again, while Cesarian births are a necessity in our world today to save the lives of mothers and children, the implication in the story is that the mother is having the baby "removed" rather than "birthed." It signifies a separation between parent and child; a sign that the mother is unwilling to undergo any discomfort for her little one. What kind of mother is a woman like that going to be if she isn't even willing to sacrifice for the child's birth?