 You have children who are diagnosed usually at what's called the 20-week scan. So about halfway through pregnancy, there's a diagnostic ultrasound that's done on every woman. Ultrasounds, as John Paul II pointed out in Evangelium Vitae, are morally neutral instruments. It's how you use the information you receive from them that can be used for ill or for good. But generally at the 20-week at-anonomical scan is when you would discover some of these congenital abnormalities.