Caffeine consumption may increase the risk of an early spontaneous abortion among non-smoking women. Heavy caffeine consumers reporting nausea had a doubled risk for spontaneous abortion. Light caffeine use has been associated with risk for spontaneous abortion among women who aborted in their last pregnancy.
Caffeine is readily transferred into breast milk. Infant caffeine ingestion can lead to infant sleeping disturbances. The effect of other substances contained in guarana is unknown. Breastfeeding may inhibit the caffeine metabolism in infants due to human milk components. Babies from mothers who consumed large amounts of caffeine daily have experienced tremors, and some experienced cardiac rhythm disturbances.
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