In recent years, we’ve had reports of babies born with DNA from three people , babies born following “IVF on wheels,” babies born from decades-old embryos , and even babies “conceived” with the aid of a sperm-injecting robot . The technology has also had a huge social impact. It has allowed for changes in the structure of families and provided more reproductive choices for would-be parents. So this week, let’s consider the technologies that have transformed babymaking. Alan Penzias, a reproductive endocrinologist at Boston IVF, has been working in IVF since the early 1990s. In those days, his lab at Yale would collect a person’s eggs, fertilize them, and culture any resulting embryos for two days, until the embryos had two or four cells. The embryos couldn’t survive any longer outside a body, so they’d be transferred to the uterus at that point. All of them . Even if there were, say, five embryos in total. Typical healthy patients could expect a live birth rate of 12% to 15%, he says.…