RE: OCs and Nutritional Composition of Breastmilk
This is an old reference that gives an extensive and still relevant
review:
Research on the Effects of Hormonal Contraceptives on Lactation:
Current Findings, Methodological Considerations and
Future Priorities
Valerie J. Hull
World Health Statistics Quarterly Rapport Trimestriel de
Statistiques Sanitaires Mondiales
Volume 36, Number 2, 1983
p. 168-200
The text is in English and French.
Frank J. Nice