Hostname: page-component-797576ffbb-gvrqt Total loading time: 0 Render date: 2023-12-02T02:08:14.036Z Has data issue: false Feature Flags: { "corePageComponentGetUserInfoFromSharedSession": true, "coreDisableEcommerce": false, "useRatesEcommerce": true } hasContentIssue false

Fertility regulation in nursing women: I. The probability of conception in full nursing women living in an urban setting

Published online by Cambridge University Press:  31 July 2008

S. Díaz
Family Planning Clinic, J.V. Lastarria 29, Santiago, Chile
O. Peralta
Department of Obstetrics and Gynaecology, Paula Jaraquemada Hospital, Santiago, Chile
Gabriela Juez
Family Planning Clinic, J.V. Lastarria 29, Santiago, Chile
Ana María Salvatierra
Family Planning Clinic, J.V. Lastarria 29, Santiago, Chile
María Eugenia Casado
Family Planning Clinic, J.V. Lastarria 29, Santiago, Chile
Eliana Durán
Family Planning Clinic, J.V. Lastarria 29, Santiago, Chile
H. B. Croxatto
Family Planning Clinic, J.V. Lastarria 29, Santiago, Chile


One hundred and thirty healthy women who were willing to breast-feed their babies were followed during the first postpartum year to assess their fertility, lactation and bleeding pattern and examine possible relationships between these variables. Seventy-five women were in full nursing and 22 in partial nursing at the end of the 6th postpartum month. Five hundred and three woman-months and nine pregnancies were recorded during full nursing between the 2nd and the 6th month after delivery. The cumulative probability of pregnancy at the end of 6 months in all full nursing women and in non-amenorrhoeic full nursing women was 10.0% and 27.2% respectively. The corresponding figure for partial nursing women was 40–5%.

By the end of the first year, the cumulative probability of pregnancy in full nursing women had increased to 33.9%. Except for the bleeding pattern, no differences were found among full nursing women who did or did not become pregnant.

It was concluded that full nursing women living in an urban setting who want to space pregnancies need additional protection at a time that depends upon the level of assurance wanted.

Research Article
Copyright © 1982, Cambridge University Press

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)


Bonte, M., Akingeneye, E., Gashakamba, M., Mbarutso, E. & Nolens, M. (1974) Influence of the socioeconomic level on the conception rate during lactation. Int. J. Fert. 19, 97.Google Scholar
Buchanan, R. (1975) Breast Feeding: Aid to Infant Health and Fertility Control. Population Reports Series J, 49. George Washington University Medical Center, Washington, DC.Google Scholar
Delgado, H., Lechtig, A., Martorell, R., Brineman, E. & Klein, R.E. (1978) Nutrition, lactation and postpartum amenorrhea. Am. J. clin. Nutr. 31, 322.Google Scholar
Graffar, M. (1956) Une methode de classification sociale de echantillons de population. Courriere, 6, 455.Google Scholar
Klaus, H., Goebel, J.M., Muraski, B., Egizio, M.T., Weitzel, D., Taylor, R.S., Fagan, M.U., Ek, K. & Hobday, K. (1979) Use-effectiveness and client satisfaction in six centers teaching the Billings ovulation method. Contraception, 19, 613.Google Scholar
Lanctot, C.A. (1979) Natural family planning. Clin. Obstet. Gynec. 6, 109.Google Scholar
Patri, A. & Sepúlveda, H. (1978) Lactancia materna. I. Evolución de la lactancia materna. Pediatría, 21 281.Google Scholar
Pérez, A. (1979) Lactational amenorrhea and natural family planning. In: Human Ovulation. Edited by Hafez, E. S. E.. Elsevier-North Holland, Amsterdam.Google Scholar
Pérez, A., Vela, P., Potter, R. & Masnick, G.S. (1971) Timing and sequence of resuming ovulation and menstruation after childbirth. Popul. Stud. 25, 491.Google Scholar
Rodriguez, G., Faundes, A.L. & Atkinson, L.E. (1976) An approach to the analysis of menstrual patterns in the critical evaluation of contraceptives. Stud. Fam. Plann. 7, 42.Google Scholar
Short, R.V. (1977) Lactation—the central control of reproduction. In: Breast-feeding and the Mother. Ciba Foundation Symposium No. 45. Elsevier–North Holland, Amsterdam.Google Scholar
Thomson, A.M., Hytten, F.E. & Black, A.E. (1975) Lactation and reproduction. Bull. Wld Hlth Org. 52, 337.Google Scholar
Van Ginneken, J.K. (1977) The chance of conception during lactation. J. biosoc. Sci. Suppl. 4, 41.Google Scholar
Vaughan, C.V. (1964) Growth and development in the infant and the child. In: Textbook of Pediatrics, 8th edn, p. 42. Edited by Nelson, W. E.. Saunders, Philadelphia.Google Scholar