The association of maternal country/region of origin and nativity with infant mortality rate among Hispanic preterm infants

Racial and Ethnic Disparities in Mother's Milk Provision Among Mothers of Preterm Infants

Importance

The extent of mother's milk provision by race and ethnicity and its change over time is poorly understood in the US preterm population.

Objective

To examine US prevalence and trends over time of mother's milk initiation and continuation at 12 weeks after birth (2009-2019) by maternal race and ethnicity and to examine associations of maternal race and ethnicity and mother's milk initiation and continuation among mothers of preterm infants.

Design, Setting, and Participants

This cross-sectional study used data from the nationally representative Pregnancy Risk Assessment Monitoring System database. Participants included mothers of preterm infants identifying as non-Hispanic Asian, non-Hispanic Black, Hispanic any race, or non-Hispanic White, with survey completion 12 or more weeks post partum from 2009 to 2019. Data were analyzed from February 2022 to June 2024.

Exposure

Maternal race and ethnicity obtained from birth certificate data.

Main Outcomes and Measures

Mother's milk initiation and continuation at 12 weeks were assessed using survey questions. The overall prevalence and trends over time by maternal race and ethnicity were determined. Multivariable regression was used to analyze independent associations between maternal race and ethnicity and mother's milk initiation and continuation.

Results

Among 1 523 131 (weighted) mother-preterm infant dyads, mother's milk initiation increased significantly from 2009 to 2019 for White and Black mothers but not for Asian or Hispanic mothers. Mother's milk provision at 12 weeks increased significantly among all groups. There were significant differences in mother's milk outcomes between groups. Initiation was highest for Asian mothers (92.8%; 95% CI, 91.1%-94.4%), followed by Hispanic (88.1%; 95% CI, 86.5%-89.8%), White (84.1%; 95% CI, 83.3%-84.9%), and Black (75.3%; 95% CI, 73.4%-76.6%) mothers. After adjusting for covariates of interest, compared with White mothers, initiation remained higher for Asian (adjusted relative risk [aRR], 1.09; 95% CI, 1.06-1.12) and Hispanic (aRR, 1.10; 95% CI, 1.08-1.12) mothers. Continuation at 12 weeks was highest for Asian mothers (65.4%; 95% CI, 62.7%-68.0%), followed by Hispanic (48.2%; 95% CI, 46.1%-50.3%), White (47.7%; 95% CI, 46.7%-48.7%), and Black (34.3%; 95% CI, 32.9%-35.7%) mothers. After adjustment, continuation was higher for Asian (aRR, 1.37; 95% CI, 1.24-1.47) and Hispanic (aRR, 1.33; 95% CI, 1.27-1.41) mothers compared with White mothers.

Conclusions and Relevance

In this cross-sectional study, mother's milk provision among preterm infants increased from 2009 to 2019, but notable racial and ethnic disparities persist. Future work should address barriers to continued provision of mother's milk for preterm infants.

The Relationship Between Hispanic Ethnicity and Outcomes for Infants Born Extremely Preterm

OBJECTIVE

To characterize the association between maternal ethnicity and infant survival to discharge without major morbidity.

STUDY DESIGN

This is secondary analysis of a prospective cohort of infants born <27 weeks of gestation at National Institute of Child Health and Human Development Neonatal Research Network centers from 2006 through 2020. The primary outcome was survival to discharge without major morbidity (sepsis, necrotizing enterocolitis, bronchopulmonary dysplasia grade 3, intracranial hemorrhage grade ≥3, periventricular leukomalacia, and advanced retinopathy of prematurity). Outcomes were compared by ethnicity and adjusted for center, perinatal characteristics, and sociodemographic characteristics.

RESULTS

Of 14 029 subjects, 2155 (15%) were Hispanic, 6116 (44%) non-Hispanic Black, and 5758 (41%) non-Hispanic White. Infants of Hispanic mothers had the lowest survival to discharge without major morbidity (Hispanic 523/2099 [25%], non-Hispanic Black 1701/5940 [29%], non-Hispanic White 1494/5597 [27%], P = .002). Adjusted odds of survival without major morbidity differed between Hispanic and non-Hispanic Black (adjusted odds ratio [aOR] 0.80, 95% CI 0.69-0.93), but not between Hispanic and non-Hispanic White infants (aOR 1.07, 95% CI 0.92-1.25). At 2 years, children of non-Hispanic White mothers had the lowest incidence of neurodevelopmental impairment (Hispanic 544/1235 [44%], non-Hispanic Black 1574/3482 [45%], and non-Hispanic White 1004/3182 [32%], P < .001). Odds of impairment were greater for Hispanic than non-Hispanic White children (aOR 1.25, 95% CI 1.05-1.48) but did not differ between Hispanic and non-Hispanic Black children (aOR 0.88, 95% CI 0.74-1.04).

CONCLUSIONS

In a multicenter cohort, infants of Hispanic mothers had lower odds of survival to discharge without major morbidity than infants of non-Hispanic Black mothers and similar odds of survival without major morbidity as infants of non-Hispanic White mothers.

CLINICALTRIALS

GOV ID

Generic Database: NCT00063063.