Comparison of Breastfeeding Practices in Mothers With Chronic Kidney Disease With or Without Kidney Transplantation.

Introduction: Existing literature on pregnant patients with chronic kidney disease (CKD) with or without kidney transplantation focuses mainly on their pregnancy outcomes, but there are scant data on their lactation outcomes. Our objective was to characterize the lactation outcomes of patients with CKD with or without kidney transplantation. Methods: This is a single-institution retrospective cohort study of female-identifying patients with CKD with or without kidney transplantation who had a birth hospitalization at a tertiary health system between 2010 and 2020. Maternal and pediatric data on medical history, pregnancy, delivery, neonatal, and lactation outcomes, medications, and care team involved were collected. Primary outcome measures were breastfeeding initiation within 24-hour postpartum, breastfeeding 8 or more times per day during hospitalization, and any breastfeeding beyond 1 month. Health professionals' comments related to lactation and medications were extracted for qualitative data analysis. Results: Patients with and without kidney transplantation had similar comorbidities, pregnancy, delivery, and neonatal outcomes, and hospital length of stay (p > 0.05). Patients without kidney transplantation were more likely to initiate breastfeeding in the first 24 hours (p = 0.03) after delivery and continue breastfeeding beyond 1 month postpartum. There was a lack of consistency between specialties regarding medication compatibility with lactation. Patients on immunosuppression were more likely to exclusively formula feed (p = 0.02) or to initiate breastfeeding and then switch to formula (p = 0.0004) because of their immunosuppressive medications versus patients on any other medication. Conclusion: Patients with CKD but without a kidney transplantation were more likely to initiate breastfeeding or provide breast milk to their infant within 24 hours of delivery, breastfeed >8 times per day during their hospital stay, and breastfeed beyond a month postpartum than those with a transplanted kidney. Lactation support and pharmacology should be incorporated into graduate medical education.