Sir Albert William Liley is often called the “Father of Fetology” for all of his research in embryology and the development of the unborn baby. Here, he talks about fetal development: The prerequisites for motion are the muscles and nerves. In the sixth to seventh week, nerves and muscles work together for the first time. If the area of the lips, the first to become sensitive to touch, is gently stroked, the child responds by bending the upper body to one side and making a quick backward motion with his arms.… By the beginning of the ninth week, the baby...