Naomi, In addition to the N.Y. Times report by Natalie Angier (May 24, 1994, p. B5) mentioned already, here is a blurb about the research from a newsletter called Weizmann NOW, from the fall of 1994: "A group of Weizmann researchers made front page news with mother's milk. They showed that in lactating laboratory animals, the mammary gland produces a peptide hormone crucial to regulating development of the human brain and sex organs. In human milk, the GnRH peptide also occurs in high concentrations. 'Mother's milk should not be regarded as a mere source of nutrition, but as a major stimulator of developmental physiology,' said Prof. Yitzchak Koch (Stevenson Chair), Department of Hormone Research, who headed the multidisciplinary team." The research was done at the Weizmann Institute, Rehovoth, Israel. You might be able to learn more from them. Anne Altshuler, RN, MS, IBCLC and LLL leader in Madison, Wisconsin mailto:[log in to unmask]