Continuously recorded suckling behaviour and its effect on lactational amenorrhoea

Area of Science:

• Reproductive endocrinology
• Human lactation studies

Background:

• The return to ovarian cyclicity after childbirth is a critical aspect of postpartum recovery and reproductive health.
• Breastfeeding patterns are widely believed to influence the resumption of menstruation, but the precise relationship requires further elucidation.

Purpose of the Study:

• To test the hypothesis that the month-specific rate of return to ovarian cyclicity is causally related to suckling patterns.
• To compare postpartum menstrual cycle recovery between two distinct populations with differing breastfeeding behaviors.

Main Methods:

• Survival analysis for time-dependent covariates was employed to analyze the time to the first postpartum menses.
• Two groups were studied: New Mexican women and a nationwide USA subpopulation from the Couple to Couple League (CCL).
• Breastfeeding performance, including daily and time-windowed feeding, and introduction of solid foods were assessed.

Main Results:

• Significant predictors of the first postpartum menses were identified.
• Substantial differences in suckling patterns were observed between the New Mexico and CCL groups, with a 5:2 differential in menstrual cycle recovery rates.
• The New Mexico population exhibited a twice-higher rate of decline in breastfeeding performance compared to the CCL sample.
• Introduction of solid feeds was a strong, independent predictor of returning menstrual cyclicity for both populations.

Conclusions:

• Suckling patterns significantly influence the rate of return to ovarian cyclicity postpartum.
• Breastfeeding intensity and duration, as reflected in suckling patterns and the timing of solid food introduction, are crucial determinants of postpartum menstrual resumption.
• The findings highlight the importance of breastfeeding practices in postpartum recovery and family planning.