The exact effects of caffeine on pregnancy are unknown. Some studies show few if any effects. Because the effects of caffeine on pregnancy are not yet clear, pregnant women should limit caffeine to less than 250-300 mg per day. Keep in mind, the typical coffee mug holds 8 oz or more of coffee. Contrary to popular belief, cocoa is not high in caffeine.
Herbal teas are good substitutes when used with caution.
Large amounts of herbal teas can cause various reactions. Chamomile, goldenrod, marigold, and yarrow can cause allergic reactions, which may include severe diarrhea and increased blood pressure. Avoid diarrhea-causing teas including senna bark, aloe, buckthorn, dock and aloe. The difference between medicinal and food use of herbs is in the amount of the herb used. The following is a partial list of Medicinal Herbs that are not considered appropriate for use during pregnancy or lactation.