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Caffeine is a stimulant and diuretic found in many soft drink beverages, tea, chocolate, over-the-counter medications and coffee. Caffeine is known to increase blood pressure and heart rate, which are not recommended during pregnancy. Caffeine also increases urination and may reduce your body's fluid levels leading to dehydration. Caffeine crosses the placenta into the unborn baby, which may cause the baby to have a difficult time metabolizing the caffeine and change your baby's sleep pattern or normal movement pattern.
Animal studies have shown that caffeine may cause birth defects, reduced fertility, low-birth weight, reproductive problems, and even preterm delivery. However, there have not been any conclusive human studies to support the animal testing. A few studies have shown that there is a correlation among women whom consume more than 300 mg (15 oz of coffee) a day and miscarriage. Experts and studies have stated that moderate levels of caffeine have not been found to have a negative effect on pregnancy. Moderate definition is between 150mg – 300 mg a day.