Maternity Care Practices and Their Role in U.S. Breastfeeding Disparities

<b><i>Introduction:</i></b> Breastfeeding provides substantial health benefits for both children and mothers; yet the U.S. rates remain suboptimal, with disparities shaped by structural, social, and policy factors. This study examines how the U.S. hospital maternity care practices influence breastfeeding initiation, with particular attention to their impact across different population groups. <b><i>Methods:</i></b> We analyzed cross-sectional county-level variations in hospital maternity care quality and breastfeeding initiation from 2017 to 2022 using data from the National Vital Statistics System and the Maternity Practices in Infant Nutrition and Care (mPINC) surveys. We employed a linear probability model to assess these relationships. <b><i>Results:</i></b> Higher county mPINC scores are significantly associated with increased breastfeeding initiation, with each additional point linked to a 0.10 percentage point (pp) increase (<i>p</i> < 0.001). This association varies by race/ethnicity. Each additional mPINC point corresponds to a 0.25 pp increase for non-Hispanic Black mothers (<i>p</i> < 0.001) and a 0.14 pp increase for non-Hispanic American Indian/Alaska Native mothers (<i>p</i> < 0.001), approximately three and two times higher, respectively, than the increase for non-Hispanic White mothers. The effect of better maternity practices also differs by county type, with a 0.08 pp increase in metro areas (<i>p</i> < 0.001) and a 0.17 pp increase in nonmetro areas (<i>p</i> < 0.001). <b><i>Conclusions:</i></b> Higher quality hospital maternity care practices are associated with increased breastfeeding initiation, particularly among population groups with historically lower breastfeeding rates. Enhancing maternity care policies and practices may help reduce long-standing breastfeeding disparities.