The conditional relationship is very clear: If a woman doesn't drink during pregnancy, her child will have a zero risk of FASD. There is no more motivated group of people then women who are pregnant or who want to become pregnant.
It's natural for pregnant women to feel besieged by the idea of environmental toxic impacts on the developing fetus. The reality is that we're all besieged by this idea. But is it better to be ignorant of the dangers?