Support WBURThe science of IVF: What to know about Alabama's 'extrauterine children' rulingPlay04:30Download AudioMaria GodoyFebruary 23, 2024 ShareAn illustration of the blastocyst stage of embryo development at about five to nine days after fertilization. The outer layer will grow to form the placenta. The inner cells will become the fetus. (Getty Images/Science Photo Library)
