... this study on pregnant women consuming caffeine seems to have legitimately covered the spectrum from very small doses up to normal and high doses.
http://www.physorg.com/news144928057.html
The conclusion is that there is a correlation between birth weight and caffeine intake, even if the intake is well below the level of one cup of coffee per day. The recommendation is to restrict intake as much as possible.
What I don't see discussed is whether this study checks for confounding effects like... do mothers who consume a small amount of caffeine per day stay more active, and is the baby thus lighter because he's not overweight? I feel like any discussion of birth weight is complicated by the fact that averages are usually used, and at least in Western countries and the US, averages reflect the increasingly obese population. (Witness the fact that our child is in the 5th percentile by weight but seems completely healthy and "right" sized. Are we blind or is America just really fat?)
I'm not scientist but that's probably a question that has to be answered.
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