That can be restated as: They do not know a limit so they set the limit to zero. No surprise there. Anything else could be dangerous for the fetus.
Annie-Xmas:
Margaret Mitchell must have known some woman who drank during her pregnancy and gave birth to a child with Fetal Alcohol Syndrome. She describes it perfectly in Gone With The Wind: When Scarlett is pregnant with her second child, she drinks alcohol every night and gies birth to Ella, a child with no attention span who is described as “scatterbrained.”
Sometimes old wives tales turn out to be correct.
That actually makes a lot of sense.
Folacin:
…My mother reports that her doctor listed drinking, smoking, and coffee and told her to give one up. She gave up coffee, although she wasn’t a heavy drinker. My four brothers and I (averaging 6’2") blame her habits for none of us making the NBA.
My older brother was born in 1972; her doctor advised her not to quite smoking because the stress would be bad for the baby.
They have been saying that for at least 40 years. (Actually what they said was, wear gloves. But I let my husband do it and he didn’t mind. He still is the major cat-box cleaner and the baby is 23.)
I’m 33 and my mother still has my father doing it.