Table 2: Phytoestrogen concentration over the course of pregnancy.

Phytoestrogen concentrations in human pregnancy N Mean Standard error Standard deviation Amniotic fluid daidzein 300 0.60 0.08 1.41 Amniotic fluid genistein 300 0.77 0.10 1.78 Serum during pregnancy daidzein 215 2.88 0.88 12.96 Serum during pregnancy genistein 215 5.18 1.84 27.02 Serum at birth daidzein 97 1.21 0.55 5.45 Serum at birth genistein 100 1.48 0.84 8.40 Cord serum daidzein 75 2.30 0.81 7.02 Cord serum genistein 85 2.68 1.07 9.87 Breast milk daidzein 90 0.25 0.11 1.03 Breast milk genistein 84 0.61 0.24 2.20