The hormonal and ecological correlates of lactation infertility

Some factors that may influence the results of studies of breastfeeding behavior in different cultures are identified. Findings of some of the demographic studies of rural areas in the so-called less developed nations are contrasted with studies in urbanized areas of such nations, as well as with studies from developed nations. A review of the physiology of lactation, specifically the role of prolactin is given along with some preliminary findings from the author's ongoing research in Australia.