Is it safe to have my morning cup of coffee during pregnancy?
Expert: Lewis Holmes, professor of pediatrics, Harvard Medical School; chief of Genetics & Teratology Unit, MassGeneral Hospital for Children, Boston
Yes. We did a very extensive study a few years ago in which we enrolled women very early in pregnancy; we found no effects on the fetus when you drink up to three cups of coffee a day; very few women drank more than that. That's the best study I know of. We can only say for sure that the first three cups are safe, but since we know up to three cups is fine, we can assume you'd have to consume a lot more than that to cause problems.
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Expert: Ronald Ruggiero, clinical professor in the departments of pharmacy and medicine, University of California, San Francisco, CA
Yes, a morning cup of coffee won't hurt anyone. I generally recommend decaffeinated products, but if you must have caffeine, then don't have more than three cups a day. That's the limit because in studies of dairy cattle, when pregnant cows were given more than that dose, their calves were born smaller. And too much caffeine cuts down on blood flow to the placenta, and you don't want to do that because the baby won't be getting as much oxygen or as many nutrients. But in moderate amounts, caffeine poses no measurable risk to the fetus.