How did pregnant women in the past know that alcohol would affect their baby? Did they know that it would affect it? If not, did that contribute to the higher rates of miscarriages and stillborn babies? Did society have higher rates of developmental disorders because of this?
Before other responses come in, you might be interested in this thread by u/SpicyBaconator and myself, as well as this entry by u/rocketsocks and this one by u/PeruvianHeadshrinker.