Does caffeine intake during pregnancy affect birth weight?
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Q: Does caffeine intake during pregnancy affect birth weight? Evidence-based answer: No. Reducing caffeinated coffee consumption by 180 mg of caffeine (the equivalent of 2 cups) per day after 16 weeks-gestation doesn't affect birth weight. Consuming more than 300 mg of caffeine per day is associated with a clinically trivial, and statistically insignificant (less than 1 ounce), reduction in birth weight, compared with consuming no caffeine (strength of recommendation: B, randomized controlled trial [RCT] and large prospective cohort study).
Journal of Family Practice, 66(03) 2016: 205, 213.