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[Study on the relationship between first ovulation and infant feeding in lactating postpartum women]
Objective:
To determine the first ovulation after delivery and to provide scientific data for contraception in lactating postpartum women.
Methods:
From January 1996 to December 1998, 101 lactating women were continuously monitored of their ovulation by ultrasound, basal body temperature (BBT) measurement and cervical mucus examination.
Results:
The evidences of first ovulation (follicle > 1.8 cm in diameter) were found by ultrasound in 53 (52.5%) women during 154 days after delivery on the average and there were 11 (10.9%, 11/101) subjects who had first ovulation during 4 months after delivery and 42 (41.6%, 42/101) subjects had, after 4 months. Significant positive correlation was found between the time of supplementary feeding and the time of the first menses (n = 100, r = 0.4764, P < 0.01) and first ovulation (n = 53, r = 0.5554, P < 0.01).
Conclusion:
For postpartum mother it is suitable to begin with birth control method at the 4th month after delivery and to prolong the breast feeding is also a good method for birth control.