Abstract
OBJECTIVES: Although breastfeeding is associated with lower postnatal depression and anxiety, limited research exists regarding long-term maternal mental health outcomes. This study examined the association between breastfeeding and depression and anxiety in women of later reproductive age (mid 30s to menopause). DESIGN: This was a 10-year prospective longitudinal cohort study. Self-reported questionnaires were used to collect lifetime breastfeeding behaviour at 10 years, and health history including depression, anxiety and medication use was collected at each study timepoint. SETTING: A tertiary level maternity hospital in Dublin, Ireland. PARTICIPANTS: 168 parous women from the ROLO Longitudinal Cohort with lifetime breastfeeding behaviour and health history data available at 10 years were included (22% of total cohort). Women currently pregnant or breastfeeding at 10-year follow-up were excluded. RESULTS: Mean (SD) age at study end was 42.4 (3.8) years. 72.6% (n=122) of women reported ever breastfeeding. Median lifetime exclusive breastfeeding was 5.5 weeks (IQR 35.8, range 0-190). 37.5% of women (n=63) breastfed for ≥12 months over their lifetime. 13.1% (n=22) reported depression or anxiety at 10 years, and 20.8% (n=35) reported depression or anxiety over the whole study period. Ever breastfeeding was associated with less depression and anxiety at 10 years (OR 0.34, 95% CI 0.12 to 0.94, p=0.04). Ever breastfeeding, longer exclusive breastfeeding and lifetime breastfeeding ≥12 months were associated with lower depression and anxiety over the whole study period (ever breastfeeding OR 0.4, p=0.03; exclusive breastfeeding OR 0.98/week, p=0.03; lifetime breastfeeding ≥12 months OR 0.38, p=0.04). CONCLUSION: There may be a protective association between breastfeeding and self-reported depression and anxiety. Further studies are required to confirm the findings. TRIAL REGISTRATION NUMBER: ISRCTN54392969.