The Role of Work as a Social Determinant of Health in Mother's Own Milk Feeding Decisions for Preterm Infants: A State of the Science Review

Mother's Own Milk Provision During the First 12 Weeks of Life by Gestational Age

Importance

Although mother's own milk (MOM) is associated with reduced risk of neonatal complications of prematurity and improved neurodevelopmental outcomes, to our knowledge, there have been no large US studies reporting rates of MOM feeding initiation and sustained MOM feedings by gestational age (GA).

Objective

To compare rates of MOM feeding initiation and continuation at 12 weeks for infants by GA.

Design, Setting, and Participants

This retrospective cross-sectional study used state-level surveillance data for maternal characteristics and behaviors before and after pregnancy. Participants were women who gave birth from January 1 through December 31, 2021, in 36 US jurisdictions (33 states, the District of Columbia, New York City, and Puerto Rico) and completed the Pregnancy Risk Assessment Monitoring System (PRAMS) questionnaire. Data were analyzed from July 2023 to April 2024.

Exposure

Infant GA, including early preterm (EPT; ≤27 weeks' gestation), moderately preterm (MPT; 28-33 weeks' gestation), late preterm (LPT; 34-36 weeks' gestation), and early term to postterm (≥37 weeks' gestation).

Main Outcomes and Measures

MOM feeding initiation and continuation at 12 weeks after delivery. Weighted multivariable binary logistic regression models were used to test the association between MOM feeding initiation and continued provision at 12 weeks after delivery by infant GA.

Results

Among 29 098 births, there were 0.4% EPT, 1.8% MPT, 6.7% LPT, and 91.1% early-term to postterm infants. Unadjusted MOM feeding initiation was highest for EPT infants (89.7% [95% CI, 85.0%-94.7%]) and lowest for LPT infants (81.8% [95% CI, 79.5%-84.1%]). For infants that initially received MOM, 71.6% (95% CI, 70.7%-72.6%) of early-term to postterm infants still received MOM at 12 weeks followed by 63.1% (95% CI, 52.9%-73.2%) of EPT infants, 61.2% (95% CI, 58.0%-64.3%) of LPT infants, and 58.6% (95% CI, 53.4%-63.8%) of MPT infants. After adjusting for maternal characteristics, LPT infants were 4.4 (95% CI, -6.7 to -2.1) percentage points less likely to initiate MOM feedings and those who received any MOM were 6.7 (95% CI, -9.9 to -3.5) percentage points less likely to receive MOM at 12 weeks compared with early-term to postterm infants. There were no differences in adjusted initiation or continuation rates among EPT (3.1 [95% CI, -1.4 to 7.5] percentage points for initiation and -0.0 [95% CI, -8.6 to 8.6] percentage points for continuation) or MPT (2.4 [95% CI, -0.5 to 5.3] percentage points for initiation and -3.3 [95% CI, -8.0 to 1.5] percentage points for continuation) infants compared with early-term to postterm infants.

Conclusions and Relevance

This cross-sectional study found that MOM feeding initiation and continuation rates at 12 weeks after birth for LPT infants were substantially lower than rates for infants with other GAs. Research is needed to pinpoint barriers to MOM feeding initiation and continuation in this vulnerable population of infants.

Racial Disparities in Mother's Own Milk Feedings Persist after Discharge from the Neonatal Intensive Care Unit

Objective: To investigate mother's own milk (MOM) feeding rates in the first year of life after neonatal intensive care unit (NICU) discharge for infants born <37 weeks gestational age and compare rates by race and ethnicity. Study Design: This was a retrospective study of preterm infants discharged from the NICU who sought care at a primary care clinic within our academic health system. Infant demographic characteristics and feeding at NICU discharge were extracted from the medical record. Post-discharge feeding history was extracted from health care maintenance (HCM) visit records at 2, 4, 6, 9, and 12 months for infants born between January 2018 and December 2019. Exclusion criteria included having a contraindication to MOM feeding or insufficient feeding documentation. Results: Of the 314 infants meeting inclusion criteria, 57% received any MOM and 24% received exclusive MOM at NICU discharge. At the 6-month HCM visit, MOM feeding rates decreased to 25% for any MOM and 12% for exclusive MOM. Statistically significant racial and ethnic differences in MOM feeding rates were observed at all HCM visits, with White infants having the highest and Black infants having the lowest MOM feeding rates. Conclusions: MOM feeding rates decreased from NICU discharge to the 12-month HCM visit. Disparities observed during the birth hospitalization persisted after discharge, with Black infants having consistently lower MOM feeding rates compared with Hispanic and White infants. These disparities highlight research opportunities to pinpoint factors contributing to the decline in MOM feedings and develop targeted interventions to address these disparities.

Where does the time go? Temporal patterns of pumping behaviors in mothers of very preterm infants vary by sociodemographic and clinical factors

Background

Mothers of very preterm (<32 weeks gestational age [GA]) infants are breast pump dependent and have shorter duration of milk provision than mothers of term infants. The opportunity (i.e., time) cost of pumping and transporting mother's own milk (MOM) from home to the NICU may be a barrier. There is a paucity of data regarding how much time mothers actually spend pumping.

Objective

To investigate the variation in pumping behavior by postpartum week, maternal characteristics, and infant GA.

Methods

Prospectively collected pump log data from mothers enrolled in ReDiMOM (Reducing Disparity in Mother's Own Milk) randomized, controlled trial included pumping date and start time and end time of each pumping session for the first 10 weeks postpartum or until the infant was discharged from the NICU, whichever occurred first. Outcomes included number of daily pumping sessions, number of minutes spent pumping per day, and pumping behaviors during 24-h periods, aggregated to the postpartum week. Medians (interquartile ranges) were used to describe outcomes overall, and by maternal characteristics and infant GA.

Results

Data included 13,994 pump sessions from 75 mothers. Maternal characteristics included 55% Black, 35% Hispanic, and 11% White and 44% <30 years old. The majority (56%) of infants were born at GA 28-31 weeks. Mothers pumped an average of less than 4 times per day, peaking in postpartum week 2. After accounting for mothers who stopped pumping, there was a gradual decrease in daily pumping minutes between postpartum weeks 2 (89 min) and 10 (46 min). Black mothers pumped fewer times daily than non-Black mothers after the first 2 weeks postpartum.

Conclusion

On average mothers pumped less intensively than the minimum recommendation of 8 times and 100 min per day. However, these pumping behaviors represent significant maternal opportunity costs that should be valued by the institution and society at large.

Work as a social determinant of maternal health: A qualitative exploration of college-educated Black women's experiences at work during pregnancy and postpartum

BACKGROUND

Black women are disproportionately impacted by higher rates of maternal mortality in the United States (US). Limited research has focused on adverse maternal health outcomes among college-educated Black women, although research has found these outcomes persistent among this population.

OBJECTIVES

This study aimed to fill a critical gap in current research by elucidating the nuanced experiences of college-educated Black women in the workplace during pregnancy and postpartum. By exploring this under-researched area, our study contributes to the academic discourse on Black maternal health disparities within the scope of occupational health. It offers practical insights for enhancing workplace gender equity, informing healthcare practices, and shaping policies that support equitable maternal health outcomes among Black women.

DESIGN

This qualitative study conducted semi-structured interviews with 17 Black mothers between March 2019 and September 2019.

METHODS

Seventeen in-depth interviews were conducted with college-educated Black women in the US from March 2019 to September 2019. Participants were asked several questions about work stress, discrimination, and other workplace experiences during pregnancy and postpartum.

RESULTS

Our analysis identified three themes, including Strong Black Woman/Superwoman, work stress (sub-themes: consciousness of work stress, mental and physical responses to stress, and work-family conflict), and perceived work-related discrimination.

CONCLUSION

For college-educated Black women experiencing pregnancy and postpartum, it is crucial to understand the structural and social determinants of optimal occupational health. It is critical that workplaces enact occupational health equity with attention to racial, gender, and disability-centered considerations to address the unique challenges experienced by Black women.