Race/ethnicity-specific associations between breastfeeding information source and breastfeeding rates among U.S. women

Methodologic considerations in estimating racial disparity of mortality among very preterm infants

This review explores methodological considerations in estimating racial disparities in mortality among very preterm infants (VPIs). Significant methodological variations are evident across studies, potentially affecting the estimated mortality rates of VPIs across racial groups and influencing the perceived direction and magnitude of racial disparities. Key methodological approaches include the birth-based approach versus the fetuses-at-risk approach, with each offering distinct insights depending on the specific research questions posed. Cohort selection and the decision for crude versus adjusted comparison are also critical elements that shape the outcomes and interpretations of these studies. This review underscores the importance of careful methodological planning and highlights that no single approach is definitively superior; rather, each has its strengths and limitations depending on the research objectives. The findings suggest that adjusting the methodological approach to align with specific research questions and contexts is essential for accurately assessing and addressing racial disparities in neonatal mortality. IMPACT: Elucidates the impact of methodological choices on perceived racial disparities in neonatal mortality. Offers a comprehensive comparison of birth-based vs. fetuses-at-risk approaches in the context of racial disparity research. Provides guidance on the cohort selection and adjustment criteria critical for interpreting studies on racial disparities in very preterm infant mortality.

Prenatal intention to human milk feed in the native Hawaiian population: predictors of any human milk feeding from birth to six months postpartum

BACKGROUND

Rates of non-communicable diseases are disproportionately high among Native Hawaiian (NH) people, and the proportion of NH infants being fed human milk (HM) is the lowest among all ethnicities within the state of Hawai'i. The aim of this study was to explore biological, socio-economic, and psychosocial determinants of the initiation and duration of human milk feeding (HMF) among a study of NH mothers and infants.

METHODS

A sample of 85 NH mother-infant dyads who were participating in a larger prospective study were involved in this research. Recruitment for the parent was delayed due to the COVID-19 pandemic. Recruitment started in November 2020 and continued until April 2022. Questionnaires were distributed at birth, two-months, four-months, and six-months postpartum. Questionnaires addressed topics relating to maternal and infant characteristics and infant feeding practices. Descriptive statistics, comparative analysis, and multivariate logistic regression tests were conducted.

RESULTS

The majority of participating mothers were aged between 31 and 35 years, had some college education or more, were employed, and multiparous. The majority of infants were receiving HM at each timepoint (94% at birth, 78% at two-months postpartum, and 76% at four and six-months postpartum). Factors found to be significantly associated with HMF initiation and duration were prenatal intention to HMF, maternal educational attainment, Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) participation, and Supplemental Nutrition Assistance Program (SNAP) recipiency. A prenatal intention to HMF was found to be a strong predictor of HMF at birth (aOR = 64.18, 95% CI 2.94, 1400.28) and at two-months postpartum (aOR = 231.55, 95% CI 2.18, 2418.3). Participants not involved with WIC were more likely to be HMF at four-months postpartum (aOR = 6.83, 95% CI 1.01, 46.23).

CONCLUSION

This research supports existing evidence that prenatal intention to HMF and higher maternal educational attainment are positive predictors of HMF. WIC participation and being a SNAP recipient were found to be negatively associated with HMF which suggests a need for more culturally tailored support. Further research is required to reduce the gap in knowledge related to the determinants of HMF in NH.

Quantifying the Association between Pump Use and Breastfeeding Duration

OBJECTIVE

To quantify the extent to which pump use is associated with breastfeeding duration.

STUDY DESIGN

We conducted a cross-sectional analysis of weighted data from the Centers for Disease Control and Prevention Pregnancy Risk Assessment Monitoring System from Maine, Michigan, New Mexico, and Utah between 2016 and 2021. Included respondents had a live-born infant at survey completion, initiated breastfeeding, and had nonmissing data for reported pump use and breastfeeding duration. Using Cox proportional hazard regression, we quantified the hazard of breastfeeding cessation and median duration (weeks) of breastfeeding by pump use. Pump use was suspected to be differentially impacted by race and ethnicity; an interaction was tested in our regression model.

RESULTS

Our sample included 19 719 mothers (weighted n = 723 808) with mean age (SD) 29.5 years (5.6). Mothers with age <18 years, Medicaid enrollment, race, and ethnicity other than non-Hispanic White, lower income or education, and unmarried status demonstrated lower pump use (P < .001). Pump use was associated with 37% lower hazard of breastfeeding cessation (adjusted hazard ratio 0.63; 95% CI: 0.56-0.70) and 21 additional weeks of breastfeeding on average. The association varied by race and ethnicity (significant interaction observed between pump use and non-Hispanic Black mothers, P = .013); stratified analysis demonstrated the lowest hazard of breastfeeding cessation among non-Hispanic Black and Native American pump users (adjusted hazard ratio 0.47 [0.40-0.54] and 0.51 [0.37-0.70], respectively).

CONCLUSIONS

Pump use was associated with longer breastfeeding duration; the greatest magnitudes of association were found among non-Hispanic Black and Native American participants, groups disproportionately affected by breastfeeding inequities. Future research examining the context around and causal impact of pump use on breastfeeding outcomes is needed.

Complex intertwined association between breastfeeding practices and household food insecurity: Systematic review and meta-analysis

Breastfeeding offers ideal food and nutrition for infants; however, structural barriers may amplify breastfeeding inequities. We aimed to identify whether household food insecurity (HFI) is associated with exclusive and continued breastfeeding (EBF and CBF) as recommended by the World Health Organization/United Nations Children's Fund (UNICEF) Following the Preferred Reporting Items for Systematic Reviews and Meta-Analysis, literature searches using 'breastfeeding', 'food insecurity' and 'infant' terms were conducted in PubMed/MEDLINE, Embase, CINAHL, Global Health and LILACS from inception through November 2023, without language restrictions, yielding 1382 publications (PROSPERO:CRD42022329836). Predetermined eligibility criteria yielded the 12 included studies (nine cross-sectional and three cohorts). The risk of bias was assessed through the Effective Public Health Practice Project. Meta-analysis was performed for studies assessing EBF (n = 10), and metaregression was used to explore heterogeneity across studies. Prevalence of EBF ranged from 1.6% to 85.3%, with a lower prevalence among HFI. The pooled effect of the association between HFI and EBF presented an odds ratio (OR) of 0.61 (95% CI = 0.49-0.76) with consistent results across marginal (OR = 0.72, 95% CI = 0.55-0.94), moderate (OR = 0.59, 95% CI = 0.41-0.84) and severe HFI (OR = 0.49, 95% CI = 0.32-0.76). High heterogeneity was found only when HFI was dichotomized. The prevalence of CBF ranged from 35.4% to 78.0%, with inconsistent prevalence among HFI; a meta-analysis was not performed due to the low number of studies (n = 3). We concluded that HFI levels are associated with lower odds of EBF. Integrating service and policy-level strategies, such as screening, referrals, skilled breastfeeding counseling and access to comprehensive nutrition and social programs, could reduce structural inequities and promote adherence to the World Health Organization/UNICEF breastfeeding recommendations among food-insecure families.

Latching Medical Students onto a Virtual Breastfeeding Elective During the COVID-19 Pandemic

Objectives: To describe the implementation of a successful two-week virtual breastfeeding elective for medical students during the COVID-19 pandemic and characterize student demographics, objective knowledge, and perspectives on breastfeeding before and after the elective. Study Design: We adapted the Santa Rosa Kaiser Permanente Family Medicine breastfeeding residency curriculum to create a two-week virtual medical student elective using Kern's six steps of curriculum development and a competency-based education framework. Educational components included self-paced modules, shadowing experiences, and group didactics. Objective knowledge was assessed with multiple-choice tests before and after the elective compared using a paired t-test. Reflective writing pieces were qualitatively analyzed using the six phases of thematic analysis developed by Braun and Clarke. Results: From 2020 to 2023, 40 medical students completed the elective. Breastfeeding knowledge increased significantly from the pre-test 72% (95% CI: 52-92%) to post-test 91% (95% CI: 81-100%) (p < 0.001). Over 90% of students felt that learning objectives were met well or very well and agreed or strongly agreed that the elective increased their knowledge and confidence in providing anticipatory guidance to breastfeeding parents. Similar themes were shared across students' reflective writing pieces, with nearly 30% (n = 23) of the student essays addressing socio-cultural and racial differences in beliefs surrounding breastfeeding. Conclusion: A virtual breastfeeding curriculum for medical students is well-received by stakeholders (patients, lactation consultants, students, etc.) and improves breastfeeding knowledge and confidence. A virtual elective is an innovative and effective way to deliver breastfeeding education and can be used even when institutional breastfeeding or lactation support is unavailable.

The epidemiology and associated factors of non-exclusive breastfeeding: a comparative cross-sectional study of livelihood-secure and insecure areas

Introduction

Regardless of national commitment, non-exclusive breastfeeding (NEBF) is a public health problem that worsens over time. It can be associated with sociodemographic, economic, and environmental factors and may vary depending on livelihood security. Hence, this study aimed to determine the magnitude of NEBF and identify its associated factors by considering two areas with varied degrees of livelihood security.

Methods

This study represented a comparative cross-sectional survey of 1,060 under 6 months (u6m) infant-mother pairs. Both descriptive and analytic statistics were evaluated using STATA version 17 packages. A binary logistic regression was used to identify associated factors of NEBF. The odds ratio (OR) with a 95% confidence interval (CI) was used to measure the significance of the association at a p-value of <0.05.

Results

The pooled magnitude of 51% of NEBF mothers (95% CI: 48.0, 54.0) was 53.1% (95% CI: 49.2, 57.0) and 48.1% (95% CI: 43.4, 52.8) in livelihood-secure and livelihood-insecure areas, respectively. The lack of recollecting the infant's birth date by mothers (AOR = 2.4; 95% CI = 1.15-4.40) had the highest odds of NEBF while household heads with tertiary education (AOR = 0.14; 95% CI = 0.01-0.54) and the poorest households (AOR = 0.43; 95%CI = 0.20-0.82) had the lowest odds of NEBF in livelihood-secure areas but not in livelihood-insecure areas. Moreover, mothers with male infants (AOR = 1.9; 95% CI = 1.18-2.92) had high odds of NEBF in livelihood-insecure areas but not in livelihood-secure areas. Infants of 2 to less than 4-month-old (AOR = 8.5; 95% CI = 3.47-18.63) and 4 to less than 6-month-old (AOR = 22.2; 95% CI = 8.02-51.97) in livelihood-secure areas and infants of 2 to less than 4-month-old (AOR = 4.3; 95% CI = 1.29-11.67) and 4 to less than 6-month-old (AOR = 8.3; 95% CI = 2.44-22.39) in livelihood-insecure areas had high odds of NEBF.

Conclusion

Over half of the mothers were practicing NEBF, which represents a failure to meet national and international targets. Area vulnerability to livelihood security modifies factors of NEBF. Male infants in insecure areas, infants of unknown age in secure areas, and infants aged 2 months or older, regardless of setting, were more vulnerable to NEBF. However, households with the lowest wealth and higher household head educational status in livelihood-secure areas were less vulnerable to NEBF. Hence, livelihood-based interventions targeting mothers of 2 to less than 6-month-old infants, with emphasis on these factors, may help address and reduce NEBF.

Early and Higher Volumes of Formula Supplementation after Birth Impact Breastfeeding Rates at Discharge in Well-Baby Nursery: A Retrospective Cohort Study

OBJECTIVE

 Physiologic breast milk production in the first 24 hours is estimated to be between 2 and 10 mL per feed. Many mothers intending to breastfeed use formula supplementation (FS) early on, which can affect successful breastfeeding. Whether the volume and timing of FS introduced in the first 24 hours of life (24 HOL) impacts the rate of "breastfeeding at discharge" (BFAD) is not well-studied and was investigated herein.

STUDY DESIGN

 Single-center, retrospective, chart review of breastfeeding infants born at ≥35 weeks who received supplementation in the first 24 HOL. Comprehensive demographic data pertaining to maternal and infant characteristics, along with infant feeding data, were collected. Four supplementation characteristics, (timing, rate, volume [mL/kg per feed], and type [expressed breast milk (EBM) or formula]) were correlated with BFAD.

RESULTS

 Among 3,102 supplemented infants in whom mothers intended to breastfeed, 1,031 (33.2%) infants were BFAD. At baseline, African American, Medicaid-insured, and single mothers had lower odds of BFAD. The overall maximum volume of FS per feed was 11.0 mL/kg (interquartile range 8.0-14.4). With each hour of delay in first supplementation, the odds of BFAD increased by 2.8% (95% confidence interval [CI] 0.022, 0.035). With every 1 mL/kg increase in the first formula volume, subsequent supplementation frequency increased by 4.5%. A positive association was observed between BFAD and a lower rate of supplementation (cutoff value ≤35.1%). However, among infants with these lower rates of supplementation, each unit increase in maximum FS, from 2 to 15 mL/kg, decreased the probability of BFAD by 4.2% (3.6-4.7%). Additionally, we observed that infants who were given at least one EBM supplementation (n = 223; 7.2%) had substantially increased rates of BFAD (odds ratio [OR] = 9.8, 95% CI 7.2-13.3).

CONCLUSION

 Early and higher volumes of FS negatively impacted BFAD. Birthweight-based FS of feeding with physiological volumes may increase breastfeeding rates at discharge.

KEY POINTS

· Higher volumes of first supplementation increases subsequent supplementation frequency.. · For each unit increase in maximum supplementation, BFAD probability decreases by 4.2%.. · Even one EBM supplementation increases rates of BFAD..

Sociodemographic inequities in food allergy: Insights on food allergy from birth cohorts

A large and growing corpus of epidemiologic studies suggests that the population-level burden of pediatric FA is not equitably distributed across major sociodemographic groups, including race, ethnicity, household income, parental educational attainment, and sex. As is the case for more extensively studied allergic disease states such as asthma and atopic dermatitis epidemiologic data suggest that FA may be more prevalent among certain populations experiencing lower socioeconomic status (SES), particularly those with specific racial and ethnic minority backgrounds living in highly urbanized regions. Emerging data also indicate that these patients may also experience more severe FA-related physical health, psychosocial, and economic outcomes relating to chronic disease management. However, many studies that have identified sociodemographic inequities in FA burden are limited by cross-sectional designs that are subject to numerous biases. Compared with cross-sectional study designs or cohorts established later in life, birth cohorts offer advantages relative to other study designs when investigators seek to understand causal relationships between exposures occurring during the prenatal or postnatal period and the atopic disease status of individuals later in life. Numerous birth cohorts have been established across recent decades, which include evaluation of food allergy-related outcomes, and a subset of these also have measured sociodemographic variables that, together, have the potential to shed light on the existence and possible etiology of sociodemographic inequities in food allergy. This manuscript reports the findings of a comprehensive survey of the current state of this birth cohort literature and draws insights into what is currently known, and what further information can potentially be gleaned from thoughtful examination and further follow-up of ongoing birth cohorts across the globe.

Pumps: A Possible Tool to Promote More Equitable Lactation Outcomes

Pregnant individuals and infants in the US are experiencing rising morbidity and mortality rates. Breastfeeding is a cost-effective intervention associated with a lower risk of health conditions driving dyadic morbidity and mortality, including cardiometabolic disease and sudden infant death. Pregnant individuals and infants from racial/ethnic subgroups facing the highest risk of mortality also have the lowest breastfeeding rates, likely reflective of generational socioeconomic marginalization and its impact on health outcomes. Promoting breastfeeding among groups with the lowest rates could improve the health of dyads with the greatest health risk and facilitate more equitable, person-centered lactation outcomes. Multiple barriers to lactation initiation and duration exist for families who have been socioeconomically marginalized by health and public systems. These include the lack of paid parental leave, increased access to subsidized human milk substitutes, and reduced access to professional and lay breastfeeding expertise. Breast pumps have the potential to mitigate these barriers, making breastfeeding more accessible to all interested dyads. In 2012, The Patient Protection and Affordable Care Act (ACA) greatly expanded access to pumps through the preventative services mandate, with a single pump now available to most US families. Despite their near ubiquitous use among lactating individuals, little research has been conducted on how and when to use pumps appropriately to optimize breastfeeding outcomes. There is a timely and critical need for policy, scholarship, and education around pump use given their widespread provision and potential to promote equity for those families facing the greatest barriers to achieving their personal breastfeeding goals.

A Public Health Emergency: Breast Cancer Among Black Communities in the United States

While Black people have a similar incidence of breast cancer compared to White people, they have a 40% increased death rate. Black people are more likely to be diagnosed with aggressive subtypes such as triple-negative breast cancer. However, despite biological factors, systemic racism and social determinants of health create delays in care and barriers to treatment. While genetic testing holds incredible promise for Black people, uptake remains low and results may be challenging to interpret. There is a need for more robust, multidisciplinary, and antiracist interventions to reverse breast cancer-related racial disparities.

Attitudes and barriers to breastfeeding among women at high-risk for not breastfeeding: a prospective observational study

BACKGROUND

Rates of breastfeeding are lower among minority and underserved populations in the United States. Our study objective was to assess pregnant persons attitudes and barriers to breastfeeding among a cohort at high risk for not breastfeeding.

METHODS

We disseminated the Iowa Infant Feeding Attitude Scale (IIFAS) to 100 pregnant persons at least 18 years of age attending a prenatal visit in a low-resource, academic practice in south-central Louisiana (Woman's Hospital). The IIFAS, as well as questions collecting information on breastfeeding experience and sociodemographic characteristics, were administered via interview. Medical records were reviewed to investigate associations between attitudes about breastfeeding in pregnancy and patient's feeding choices during the delivery hospital stay. Fisher exact tests and Wilcoxon rank-sum tests were used to assess associations between categorical and continuous variables respectively.

RESULTS

Of the 98 participants who completed the study, 8% were Hispanic, 63% were Black, 95% were Medicaid eligible, and 50% were unemployed. 59% (n = 58) went on to breastfeed/combination breast-formula feed (called "Any-Breastfeeding Group") during the delivery stay. Total IIFAS score during pregnancy was significantly higher among those who went on to breastfeed during delivery hospital stay (Any-Breastfeeding Group vs. Formula-Feeding-Only Group: 58.9 ± 5.5 vs. 53.7 ± 6.2 respectively, p < 0.001). In the group that went on to only formula feed (Formula-Feeding-Only Group), only 4% agreed breastfeeding was more convenient when surveyed during pregnancy, compared to 45% of the Any-Breastfeeding Group. 60% of Formula-Feeding-Only Group agreed formula is as healthy as breast milk.

CONCLUSION

The three major themes that coincided with favorability toward breastfeeding in the study, and can be addressed during prenatal counseling, are: mother-infant bonding, convenience, and health benefits. By identifying attitudes and barriers to breastfeeding for patients during pregnancy who went on to not breastfeed, directed educational opportunities can be developed to address these specific attitudes to ultimately increase breastfeeding initiation and continuation.

Comparing Group Versus Individual Prenatal Care on Breastfeeding Practice and Motivational Factors

OBJECTIVE

Although breastfeeding in the first 6 months postpartum benefits both infants and mothers, breastfeeding rates remain low. This study examined whether group prenatal care was associated with an increased breastfeeding initiation and duration compared with those receiving usual, individual prenatal care. A secondary aim was to investigate whether sociodemographic and motivational factors were associated with breastfeeding initiation and duration across prenatal care groups.

METHODS

Pregnant women in their third trimester (n = 211) from an innercity university medical center participated. Prenatal care type was identified from the medical chart, and data on breastfeeding duration at 1, 3, and 6 months postpartum were collected. Breastfeeding motivational factors were assessed with a survey. Logistic regressions and independent-samples t tests were used for data analyses.

RESULTS

After controlling for demographic factors, group prenatal care was associated with increased breastfeeding at 6 months postpartum (odds ratio = 2.66; P = .045) compared with individual care. Breastfeeding intention (P < .001), competence (P = .003), and autonomous motivation (P < .001) were significantly higher, while amotivation (P = .034) was significantly lower in group compared with individual prenatal care.

CONCLUSIONS

Breastfeeding persistence was higher among women receiving group prenatal care, potentially due to motivational factors. Future studies should investigate how breastfeeding motivational factors could be effectively targeted in prenatal care to increase breastfeeding persistence.

The Importance of a Healthy Microbiome in Pregnancy and Infancy and Microbiota Treatment to Reverse Dysbiosis for Improved Health

BACKGROUND

The microbiome of newborn infants during the first 1000 days, influenced early on by their mothers' microbiome health, mode of delivery and breast feeding, orchestrates the education and programming of the infant's immune system and determines in large part the general health of the infant for years.

METHODS

PubMed was reviewed for maternal infant microbiome health and microbiota therapy in this setting with prebiotics, probiotics, vaginal seeding and fecal microbiota transplantation (FMT).

RESULTS

A healthy nonobese mother, vaginal delivery and strict breast feeding contribute to microbiome health in a newborn and young infant. With reduced microbiome diversity (dysbiosis) during pregnancy, cesarean delivery, prematurity, and formula feeding contribute to dysbiosis in the newborn. Microbiota therapy is an important approach to repair dysbiosis in pregnant women and their infants. Currently available probiotics can have favorable metabolic effects on mothers and infants, but these effects are variable. In research settings, reversal of infant dysbiosis can be achieved via vaginal seeding or FMT. Next generation probiotics in development should replace current probiotics and FMT.

CONCLUSIONS

The most critical phase of human microbiome development is in the first 2-3 years of life. Preventing and treating dysbiosis during pregnancy and early life can have a profound effect on an infant's later health.

Lactation physiokinetics-using advances in technology for a fresh perspective on human milk transfer

Introduction

Though the nature of breastfeeding is critical, scant information is available on how the action of the milk transfer from mother to infant is regulated in humans, where the points of dysfunction are, and what can be done to optimize breastfeeding outcomes. While better therapeutic strategies are needed, before they can be devised, a basic scientific understanding of the biomechanical mechanisms that regulate human milk transfer from breast to stomach must first be identified, defined, and understood.

Methods

Combining systems biology and systems medicine into a conceptual framework, using engineering design principles, this work investigates the use of biosensors to characterize human milk flow from the breast to the infant's stomach to identify points of regulation. This exploratory study used this framework to characterize Maternal/Infant Lactation physioKinetics (MILK) utilizing a Biosensor ARray (BAR) as a data collection method.

Results

Participants tolerated the MILKBAR well during data collection. Changes in breast turgor and temperature were significant and related to the volume of milk transferred from the breast. The total milk volume transferred was evaluated in relation to contact force, oral pressure, and jaw movement. Contact force was correlated with milk flow. Oral pressure appears to be a redundant measure and reflective of jaw movements.

Discussion

Nipple and breast turgor, jaw movement, and swallowing were associated with the mass of milk transferred to the infant's stomach. More investigation is needed to better quantify the mass of milk transferred in relation to each variable and understand how each variable regulates milk transfer.