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Can I drink coffee during pregnancy?

Caffeine can cross the placenta and affect fetal heart rate and respiration, so limit your consumption. Up to 300mg of caffeine a day (an 8-ounce cup of coffee has about 150mg, a 12-ounce can of soda has 35 to 50mg, and an 8-ounce cup of black tea has abut 40mg) is okay.