Filming human embryos used for in vitro fertilization (IVF) at an early stage in their development has allowed scientists to select those with the best chance of going on to develop into healthy babies, with an accuracy of more than 93%.

Once the technique is available for use in IVF clinics, it should eliminate the need to simultaneously implant several embryos into the uterus — a practice used to increase the chances of successful pregnancy. It could also prevent the problems associated with multiple pregnancy, which occurs when several of the implanted embryos go on to develop successfully.