*  Use of Soy Protein-Based Formulas in Infant Feeding | FROM THE AMERICAN ACADEMY OF PEDIATRICS | Pediatrics
Isoflavones are excreted in human milk, although the concentration is very low. The concentration of isoflavones in human milk ... Phytoestrogens consist of several groups of nonsteroidal estrogens, including isoflavones. Isoflavones are commonly found in ... Son HY, Nishikawa A, Ikeda T, Imazawa T, Kimura S, Hirose M. Lack of effect of soy isoflavone on thyroid hyperplasia in rats ... Setchell KD, Cassidy A. Dietary Isoflavones: biological effects and relevance to human health. J Nutr.1999;129 (3):758S- 767S. ...
http://pediatrics.aappublications.org/content/121/5/1062