Probably because they didn’t know they were pregnant and then stopped once finding out 
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Seriously! What a waste of money running this study
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This explains a lot
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why would you drink while pregnant, i thought alcohol was bad for babiespic.twitter.com/DGdXAY9j45
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Having taught a student with alcohol syndrome I would hope more women could forgo alcohol for a short 9 months. This student was unable to remember much from one day to the next. Spent most of the time repeating everything in the hopes they could retain some knowledge.
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Um, most women don’t know they are pregnant for half the first trimester, so...
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Genius! Perhaps because a lot of women don't know in the first trimester.
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Fetal alcohol syndrome is brain damage for life.
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