There’s a good article here on Sp!ked by Ellie Lee arguing that it is moralism, not evidence, that underpins the advice that pregnant women should abstain from alcohol. “Foetal Alcohol Syndrome” is often put forward as a reason for total abstinence from expectant mothers, but, as she points out, this stems from the view the alcohol in any quantity is harmful. While FAS undoubtedly exists, it is something that affects the babies of alcoholics, not of women drinking six units a week.