According to research published on bmj.

The authors also mentioned that the hyperlink between caffeine and FGR was more powerful in women who metabolised caffeine quicker. The authors explain that, although these reductions in birth weight might seem small given that the average birth weight has ended 3kg, a drop of 60-70 g could be very important to a baby that had been little and at risk. Pregnant women should remember to reduce their caffeine consumption before and during pregnancy significantly, they warn.If we just look at specific biological parameters such as blood circulation pressure or cholesterol, we would miss the fact that the first childhood experiences are related to a much broader set of biological risk indicators – suggesting the number of health threats that may result from such adverse childhood exposures . The authors remember that the findings derive from a cross-sectional analysis and don’t prove causation. It used information supplied by the participants, therefore there might be some recall bias. Also, the analysis might not have captured other elements affecting regulatory systems, such as poor nutrition or environmental pollution.