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Fertil Steril. 1999 Sep;72(3):431-40.

The World Health Organization multinational study of breast-feeding and lactational amenorrhea. III. Pregnancy during breast-feeding. World Health Organization Task Force on Methods for the Natural Regulation of Fertility.

[No authors listed]

Abstract

OBJECTIVE:

To determine the risk of pregnancy during lactational amenorrhea relative to infant feeding status.

DESIGN:

Prospective longitudinal study.

SETTING:

Five developing and two developed countries.

PATIENT(S):

Four thousand one hundred eighteen breast-feeding mother-infant pairs.

INTERVENTION(S):

Infant feeding practices, menstrual status, and pregnancy were measured.

MAIN OUTCOME MEASURE(S):

Life-table rates of pregnancy.

RESULT(S):

In the first 6 months after childbirth, cumulative pregnancy rates during amenorrhea, depending on how the end of amenorrhea was defined, ranged from 0.9% (95% confidence interval [CI] = 0%-2%) to 1.2% (95% CI = 0%-2.4%) during full breast-feeding, and from 0.7% (95% CI = 0.1%-1.3%) to 0.8% (95% CI = 0.2%-1.4%) up to the end of partial breast-feeding. At 12 months, the rates ranged from 6.6% (95% CI = 1.9%-11.2%) to 7.4% (95% CI = 2.5%-12.3%) during full breast-feeding, and from 3.7% (95% CI = 1.9%-5.5%) to 5.2% (95% CI = 3.1%-7.4%) up to the end of partial breast-feeding.

CONCLUSION(S):

These results support the Bellagio Consensus on the use of lactational amenorrhea for family planning, and confirm that the lactational amenorrhea method is a viable approach to postpartum contraception.

PMID:
10519613
[Indexed for MEDLINE]

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