This is an excellent essay by Dr. Garst. She writes concerning childbirth, the menstrual cycle, clitoris, and breasts. Here's a money quote concerning childbirth:
"The reason for the pain in childbirth is understandable with a quick lesson in evolution. When our ancestors started to walk upright, the shape of the pelvis began to change to accommodate a walking gait. Specifically, a narrower pelvis developed. Over hundreds of thousands of years, human brains gradually became more complex and grew bigger to accommodate a higher level of intelligence. The coincidence of these two changes resulted in a baby with a larger head being delivered through a narrower pelvis. Pain, therefore, results as the mother pushes a bigger baby through a smaller opening. (Today, where a child cannot be delivered through this opening, a caesarean section must be performed.)" LINK.At the end of her essay Garst recommends a book I blurbed which was written by Dr. Abby Hafer, The Not-So-Intelligent Designer: Why Evolution Explains the Human Body and Intelligent Design Does Not. Hafer wrote a chapter for my soon to be released anthology Christianity in the Light of Science: Critically Examining the World's Largest Religion. Garst wrote a blurb for that anthology. There, that about covers everything. ;-) Enjoy. Go read it. Now. Read and learn.