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Applications of field studies to research on the physiology of human reproduction; lactation and its effects upon birth intervals in eleven Punjab villages, India

Potter, R.G.; New, M.L.; Wyon, J.B.; Gordon, J.E.

Journal of Chronic Diseases 18(11): 1125-1140

1965

ISSN/ISBN: 0021-9681
PMID: 5842300
Document Number: 520406
On the basis of monthly visits over 3-5 yr to married women aged 15-44 yr residing in 11 Punjab villages, histories were obtained of some 1, 300 that provided information about interpregnancy intervals, defined as intervals from delivery to next conception. Lactation substantially prolonged post-partum amenorrhoea. When an infant survived 1 month or more, lactation usually lasted well over 1 yr and the median length of the amenorrhoea was 10 months for women aged 20-29 yr and 12 months for those aged >30 yr, whereas if the child was stillborn or died in the 1st month of life the mother did not lactate and the median length of the amenorrhoea was -2 months.

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