Other studies fail to show a link between caffeine and problems in pregnancy. In animal studies, a massive amount of caffeine is known to be teratogenic, causing birth defects. It is known to cause changes to blood vessels that could influence circulation to the uterus and placenta. Most doctors recommend limiting its use in pregnancy, usually to no more than 2 average-sized cups per day. Talk with your doctor and get their recommendation.
Coffee is the most commonly thought of source of caffeine but caffeine is in many other products.
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