The COVID-19 Pandemic Contributed to Disparities in Housing-Cost Burden Among WIC-Participating Households in the Most Populous County in California.

Affordable housing is necessary for the health and well-being of children and families. The coronavirus disease 2019 (COVID-19) pandemic affected the ability of low-income families to pay for housing. The aim of this study is to evaluate associations between household characteristics of participants of the Special Supplemental Nutrition Program for Women, Infants and Children (WIC), and housing-cost burden during the pandemic. WIC is a federally-funded nutrition assistance program for low-income mothers, infants, and children up to the age of 5. Data were from a 2020 survey of a random sample of WIC households (n = 5815) in Los Angeles County. Ordinal logistic regression determined the odds of being housing-cost burdened by parent respondent's race/ethnicity, household composition, employment, residence, and housing cost. Logistic regression determined if the pandemic contributed to the housing-cost burden. A total of 61% of households reported housing-cost burden, with two-thirds attributing the burden to the pandemic. Spanish-speaking Hispanic parents and white parents reported a higher prevalence of pandemic-related burden, while Asian, Black, and English-speaking Hispanic parents reported a higher prevalence of burden unrelated to the pandemic. Single-parent households, those experiencing residential instability, and those with high housing costs had higher odds of burden. Spanish-speaking Hispanic parents, white parents, homeowners, and those with high housing costs were more likely to attribute the burden to the pandemic. To ensure that existing inequities are not exacerbated, it is vital that housing assistance be available to low-income households that were disproportionately affected by the pandemic.

Evaluating the impact of community interventions on childhood obesity in populations living in low-income households in Los Angeles: A simulation study.

BACKGROUND: The complex multifactorial nature of childhood obesity makes community interventions difficult to evaluate using traditional approaches; innovative methods are needed. OBJECTIVE: To evaluate the impact of various interventions targeting childhood obesity-related behaviours, and classified as using a micro-level (e.g., home visitation programs) or macro-level (e.g., business practices) strategy, on obesity among children enrolled in the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC). METHODS: We simulated a population of 1500 children enrolled in WIC, with specific diet, physical activity, breastfeeding behaviours and body mass index z-scores (BMIz), following them from age 2 to 5 years. RESULTS: Combined interventions targeting breastfeeding appeared to be moderately effective, reducing BMIz by 0.03 (95% CI -005, -0.01). Two strategy-specific interventions, home visitation programs and business practices targeting obesity-related behaviours, appeared to be moderately effective at reducing BMIz by 0.04 (95% CI -0.06, -0.02) and 0.02 (95% CI -0.04, 0.00), respectively. Contrary to expectation, combining all micro and macro interventions appeared to have no impact or moderately increased the proportion of obesity/overweight among children. CONCLUSION: Interventions targeting breastfeeding behaviour were most effective when both micro and macro strategies were implemented. Interventions targeting obesity-related behaviours in general were effective for two strategies, home visitation and business practices.

Nomadic Tibetan women's reproductive health: findings from cross-sectional surveys with a hard-to-reach population.

BACKGROUND: Western China has undergone substantial sociodemographic change, yet little is known about the health status of ethnic minority populations living in these areas. METHODS: We report findings from two cross-sectional surveys conducted with female Tibetan nomads living in rural areas of Western China/Eastern Tibet. We present results of descriptive analyses of data collected from reproductive-aged females who attended community health fairs in 2014 (n = 193) and 2016 (n = 298). RESULTS: On average, sexual debut preceded marriage among study participants, with fertility near replacement levels (2.7 and 2.1 in 2014 and 2016, respectively). Contraceptive use was common, and dominated by use of IUDs and female sterilization. Although over three-quarters (76%) of 2016 survey participants reported ever having at least one sexually transmitted infection (STI) symptom, there was low awareness of STIs (59%) and action to prevent STIs (21%). Younger women (< 40) were more likely to report having had had an STI symptom, as compared to older women (84% versus 71%; p < 0.05). CONCLUSIONS: We demonstrate feasibility of collecting data with this hard-to-reach population. Reporting of STI symptoms warrants further investigation to identify and address health conditions in this population of Tibetan nomadic women, especially amidst broader social and contextual changes that may affect the Tibetan population.

Western China has undergone substantial sociodemographic change, yet little is known about the health status of ethnic minority populations living in these areas. We report findings from two cross-sectional surveys conducted with female Tibetan nomads living in rural areas of Western China/Eastern Tibet. We present results of descriptive analyses of data collected from reproductive-aged females who attended community health fairs in 2014 (n = 193) and 2016 (n = 298). On average, sexual debut preceded marriage among study participants, with fertility near replacement levels (2.7 and 2.1 in 2014 and 2016, respectively). Contraceptive use was common, and dominated by use of IUDs and female sterilization. Although over three-quarters (76%) of 2016 survey participants reported ever having at least one sexually transmitted infection (STI) symptom, there was low awareness of STIs (59%) and action to prevent STIs (21%). Younger women (less than 40 years old) were more likely to report having had had an STI symptom, as compared to women over 40 years old (84% versus 71%; p < 0.05). We demonstrate feasibility of collecting data with this hard-to-reach population. Reporting of STI symptoms warrants further investigation to identify and address health conditions in this population of Tibetan nomadic women, especially amidst broader social and contextual changes that may affect the Tibetan population.

Longitudinal trajectories of adiposity-related measures from age 2-5 years in a population of low-income Hispanic children.

BACKGROUND: We estimated longitudinal trajectories of body mass index (BMI) z-score and percentile, weight for height (WFH) z-score and percentile, and percentage of the 95th BMI percentile (BMIp95) among low-income Hispanic children ages 2-5 years to provide normative data for this population and compare the behavior of different measures. METHODS: Longitudinal height and weight measurements obtained from 18,072 Hispanic children aged 2-5 years enrolled in the Special Supplemental Nutrition Program for Women, Infants and Children in Los Angeles County were analyzed. Trajectories of adiposity-related measures were estimated using mixed models, stratified by sex and BMI percentile at age 2 years. RESULTS: For children in the 5th-85th BMI percentile at age 2 years, all adiposity-related measures rose during ages 2-3.5 years; during ages 3.5-5 years, BMI-based measures increased, BMIp95 decreased, and WFH-based measures were stable. For children exceeding the 85th BMI percentile at age 2 years, measures generally trended downward during ages 2-5 years, except for BMIp95, which had variable trends. CONCLUSIONS: Adiposity measures changed at different rates as children grew during ages 2-3.5 years compared to ages 3.5-5 years, and different measures displayed different trends. Studies should consider examining multiple measures and focusing on change relative to a comparison group. IMPACT: To address the childhood obesity epidemic, information on normative trajectories of adiposity-related measures in at-risk populations of young children is needed. Longitudinal analysis of data collected from low-income Hispanic children during ages 2-5 years revealed different patterns for different adiposity measures and for ages 2-3.5 years versus 3.5-5 years. Child obesity studies should consider examining multiple adiposity measures and focus on change relative to a comparison group to avoid misinterpreting longitudinal patterns.

Severe Housing-Cost Burden and Low-Income Young Children's Exposure to Adverse Experiences: A Cross-Sectional Survey of WIC Participants in Los Angeles County.

OBJECTIVE: Substantial literature has documented adverse childhood experiences' (ACEs) link with poor health in childhood and adulthood. Despite many American low-income families spending more than a third of their income toward housing costs, little research has been published about a link between severe housing-cost burden and ACEs. The objective of this study was to examine the association of severe housing-cost burden to the ACEs to which young, low-income children are exposed. METHODS: Participants were 2-5-year-olds who participated in the Special Supplemental Nutrition Program for Women, Infants and Children (WIC) in Los Angeles County. We used data from the 2017 Los Angeles County WIC Survey, a survey of a random sample of all WIC participants living in Los Angeles County. Separate multiple logistic regression analyses were conducted to examine the association of severe housing-cost burden (very difficult to pay for housing) with the ACEs of financial hardship (household food insecurity, extreme poverty, parent's unemployment and underemployment), household dysfunction (parent's poor mental well-being and parent's separation), housing insecurity (doubled up and residential instability), and parent's experience with homelessness. RESULTS: Sixteen percent of children lived in severe housing-cost burdened households and 14% experienced at least 4 ACEs. After adjusting for sociodemographic characteristics and social support, severe housing-cost burden was associated with an increase in the odds of each of the ACEs. CONCLUSIONS FOR PRACTICE: While further research is needed, findings highlight the need for policymakers to provide resources and support for housing-cost burdened children. Also, service providers should identify ACEs among housing cost-burdened children.

Notes From the Field: Creating a Typology of Childhood Obesity Intervention Strategies.

Classification systems can be useful for evaluating and communicating the impact of interventions. We describe how a typology was created to inform the development of a community intervention dose index (CIDI) intended to measure the strength of impacts attributed to multiple childhood obesity intervention strategies implemented in a large, diverse urban jurisdiction in the United States during 2000-2016. The categorization system was constructed via a three-stage process: (Stage 1) identify relevant constructs for categorizing intervention strategies; (Stage 2) review peer-reviewed literature and program requests for proposals to identify and integrate common attributes of intervention strategies based on Stage 1 constructs; and (Stage 3) vet the results from prior stages to develop a final version of the typology, slated for research application and for use in program improvement. The final system grouped strategies into four macrolevel and five microlevel categories. Macrolevel strategies included government/public institutional policies, infrastructure investments, and business practices. Microlevel strategies included group education, counseling, health communication and social marketing, home visitation, and screening and referral. Grouping intervention strategies in a purposeful, classified manner facilitated communications among researchers and practitioners during the gathering and quantifying of intervention data for the CIDI project and may be used to guide scarce public health resource allocation decisions.

Breastfeeding Outcomes Among WIC-Participating Infants and Their Relationships to Baby-Friendly Hospital Practices.

Background: Breastfeeding rates among low-income children participating in the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) lag behind national rates. In Los Angeles County (LAC), recent efforts have been made to increase the number of Baby-Friendly designated hospitals. This study examines changes in Baby-Friendly hospital practices, breastfeeding outcomes, and their relationships with Baby-Friendly hospital status among WIC-enrolled children in LAC. Methods: Cross-sectional data from the triennial LAC WIC Survey (2008 through 2017) were analyzed (n = 6,449) to examine changes in Baby-Friendly hospital practices over time, and differences in breastfeeding outcomes by specific Baby-Friendly hospital practices. Multivariate logistic regression was used to evaluate the relationship between the number of Baby-Friendly hospital practices that mothers met and any and exclusive breastfeeding outcomes. Results: In 2017, mothers surveyed were more likely to engage in Baby-Friendly hospital practices compared with 2008. Any and exclusive breastfeeding outcomes at 1 and 3 months significantly increased since 2014, and breastfed infants were more likely to have mothers who participated in Baby-Friendly hospital practices. The more Baby-Friendly hospital practices mothers met, the better the breastfeeding outcomes. However, there is room for improvement in the uptake of Baby-Friendly hospital practices in Baby-Friendly hospitals. Conclusion: Effort is needed to ensure Baby-Friendly hospitals have support to continuously comply with all steps to maintain Baby-Friendly designation, and non-Baby-Friendly hospitals have support to incorporate these practices into hospital protocols.

Economic evaluation of California prenatal participation in the Special Supplemental Nutrition Program for Women, Infants and Children (WIC) to prevent preterm birth.

There is growing evidence that prenatal participation in the Special Supplemental Nutrition Program for Women, Infants and Children (WIC) reduces the risk of adverse birth outcomes. With recent changes in health care, rising health care costs, and increasing rates of prematurity in the U.S., there is urgency to estimate the potential cost savings associated with prenatal WIC participation. A cost-benefit analysis from a societal perspective with a time horizon over the newborn's life course for a hypothetical cohort of 500,000 Californian pregnant women was conducted in 2017. A universal coverage, a status quo ('business as usual') and a reference scenario (absence of WIC) were compared. Total societal costs, incremental cost savings, return on investment, number of preterm births prevented, and incremental net monetary benefits were reported. WIC resulted in cost-savings of about $349 million and the prevention of 7575 preterm births and would save more if it were universal. Spending $1 on prenatal WIC resulted in mean savings of $2.48 (range: $1.24 to $6.83). Decreasing prenatal WIC enrollment by 10% would incur additional costs (i.e. loss) of about $45.3 million to treat the resulting 981 preterm babies. In contrast, a 10% increase in prenatal WIC enrollment would prevent 141 preterm births and achieve additional cost-savings of $6.5 million. The findings confirm evaluations from the early 1990s that prenatal WIC participation is cost-saving and cost-effective. Further savings could be achieved if all eligible women were enrolled in WIC. Substantial preterm birth-related costs would result from reductions in WIC participation.

Severe housing-cost burden and obesity among preschool-aged low-income children in Los Angeles County.

Despite high rates of housing-cost burden in the United States, little is known regarding its impact on childhood obesity. In this article, we determine whether low-income 2-5-year-olds living in housing-cost burdened households are more likely to be obese and examine the potential moderators and behavioral and psychosocial mediators of this relationship. We used data from a triennial survey (2011, 2014) of a random sample of Los Angeles County participants of the Special Supplemental Nutrition Program for Women, Infants and Children (n = 2307). Logistic regression was used to examine the association between child's obesity status (Body Mass Index for age and sex ≥ 95th percentile) and severe housing-cost burden (finding it very difficult to pay for housing). Mother's depressive symptoms and child's diet and screen time were tested for mediation. We found that 16% of children lived in severe housing-cost burdened households. Severe housing-cost burden was associated with an increase in the odds of childhood obesity [aOR (95%CI) = 1.33 (1.00, 1.78)] and household size moderated this relationship. Child's diet and screen time and mother's depressive symptoms were not mediators. Given the high and vacillating rates of early childhood obesity and the increasing burden of housing costs in low-income populations, there is an urgency to better understand the role of housing-cost burden in epidemiologic investigations of early childhood obesity.

Trends in Socioeconomic Disparities in Obesity Prevalence among Low-Income Children Aged 2-4 Years in Los Angeles County, 2003-2014.

BACKGROUND: Obesity prevalence among low-income preschool-aged children in the United States decreased between 2010 and 2014. However, this decreasing trend may be varied across socioeconomic subgroups. This study examined trends in obesity prevalence among low-income children from 2003 to 2014 by child's age and household and neighborhood socioeconomic status (SES). METHODS: This study used administrative data for all children, aged 2-4 years, participating in the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) in Los Angeles County (LAC) during the years 2003-2014. Obesity was defined as having a BMI ≥95th percentile of CDC's age- and sex-specific growth charts. Household income and household educational attainment were indicators of household SES. Neighborhood median household income was an indicator of neighborhood SES. RESULTS: Childhood obesity prevalence increased sharply from 15.7% in 2003 to 19.1% in 2005, and remained constant until 2010, when it started decreasing. During most years, the prevalence of obesity was higher among the lowest SES groups. Despite the recent decreasing trend, the 2014 estimates were still generally higher than the 2003 levels except among some low-income children living in less-poor and more-educated households. CONCLUSIONS: The decreasing trend between 2010 and 2014 among WIC-participating children in LAC is encouraging and mirrors national trends among WIC-participating children. However, continued efforts should be made to focus obesity prevention efforts on low-income children, especially those who are the most vulnerable as they have experienced significant gains in obesity since 2003.

Widening socio-economic disparities in early childhood obesity in Los Angeles County after the Great Recession.

OBJECTIVE: While economic crises can increase socio-economic disparities in health, little is known about the impact of the 2008-09 Great Recession on obesity prevalence among children, especially low-income children. The present study examined whether socio-economic disparities in obesity among children of pre-school age participating in a federal nutrition assistance programme have changed since the recession. DESIGN: A pre-post observational study using administrative data of pre-school-aged programme participants from 2003 to 2014. Logistic regression was used to examine whether the relationship between obesity prevalence (BMI≥95th percentile of the Centers for Disease Control and Prevention's growth charts) and three measures of socio-economic status (household income, household educational attainment, neighbourhood-level median household income) changed after the recession by examining the interaction between each socio-economic status measure and a 5-year time-period variable (2003-07 v. 2010-14), stratified by child's age and adjusted for child's sociodemographic characteristics. SETTING: Los Angeles County, California, USA. SUBJECTS: Children aged 2-4 years (n 1 637 788) participating in the Special Supplemental Nutrition Program for Women, Infants, and Children. RESULTS: The magnitude of the association of household income and household education with obesity increased after 2008-09 among 3- and 4-year-olds and 2- and 3-year-olds, respectively. However, the magnitude of the association of neighbourhood-level median household income with obesity did not change after 2008-09. CONCLUSIONS: Disparities in obesity by household-level socio-economic status widened after the recession, while disparities by neighbourhood-level socio-economic status remained the same. The widening household-level socio-economic disparities suggest that obesity prevention efforts should target the most vulnerable low-income children.

Baby-Friendly Hospital Initiative and Breastfeeding Among WIC-Participating Infants in Los Angeles County.

BACKGROUND: Breastfeeding rates among low-income infants lag behind national rates. Policies such as the Baby-Friendly Hospital Initiative (BFHI) improve breastfeeding and may benefit low-income populations such as those who participate in the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC). A recent effort exists to increase the number of Baby-Friendly designated hospitals in Los Angeles County (LAC). Research aim: This study aimed to determine whether the BFHI effort has had a beneficial effect on Baby-Friendly hospital practices in LAC hospitals and to determine if birthing hospitals' Baby-Friendly designation status is associated with breastfeeding outcomes among WIC-participating children in LAC. METHODS: Data came from the Los Angeles County WIC Survey (2008, 2011, 2014), which is conducted on a random sample of approximately 5,000 WIC families living in LAC. The prevalence of three Baby-Friendly hospital practices was examined between 2008 and 2014. Logistic regression was used to examine the association of birthing hospitals' Baby-Friendly designation status with any breastfeeding and exclusive breastfeeding at 1, 3, and 6 months. RESULTS: The rates of Baby-Friendly hospital practices have improved since 2008. Although no association existed with rates of any breastfeeding, being born in a hospital designated Baby-Friendly or in the process of obtaining this designation was significantly associated with an increased odds of exclusive breastfeeding at 1 and 3 months. CONCLUSION: The BFHI may help achieve recommended exclusive breastfeeding rates, especially for low-income populations. Additional strategies are needed to support low-income mothers in LAC with all levels of breastfeeding.

Projecting the impact of hypothetical early life interventions on adiposity in children living in low-income households.

BACKGROUND: It is difficult to evaluate the effectiveness of interventions aimed at reducing early childhood obesity using randomized trials. Objective To illustrate how observational data can be analysed using causal inference methods to estimate the potential impact of behavioural 'interventions' on early childhood adiposity. Methods We used longitudinal data from 1054 children 1-5 years old enrolled in the Special Supplemental Nutrition Program for Women, Infants and Children and followed (WIC) from 2008 to 2010 for a mean duration of 23 months. The data came from a random sample of WIC families living in Los Angeles County in 2008. We used the parametric g-formula to estimate the impact of various hypothetical behavioural interventions. Results Adjusted mean weight-for-height Z score at the end of follow-up was 0.73 (95% CI 0.65, 0.81) under no intervention and 0.63 (95% CI 0.38, 0.87) for all interventions given jointly. Exclusive breastfeeding for 6 months or longer was the most effective intervention [population mean difference = -0.11 (95% CI -0.22, 0.01)]. Other interventions had little or no effect. Conclusions Compared with interventions promoting healthy eating and physical activity behaviours, breastfeeding was more effective in reducing obesity risk in children aged 1-5 years. When carefully applied, causal inference methods may offer viable alternatives to randomized trials in etiologic and evaluation research.

Dietary Behaviors among Public Health Center Clients with Electronic Benefit Transfer Access at Farmers' Markets.

BACKGROUND: Although increasing access to electronic benefit transfer (EBT) at farmers' markets has become a popular strategy for encouraging healthy eating, its relationships to a number of dietary behaviors in low-income populations are not well understood. OBJECTIVE: To describe the frequency of and relationships between EBT access, fruit and vegetable intake, and sugar-sweetened beverage (SSB) consumption among public health center (PHC) clients with access to EBT at farmers' markets during 2011-2012. DESIGN: Cross-sectional. PARTICIPANTS/SETTING: Low-income participants recruited from the waiting rooms of five multipurpose PHCs operated by the Los Angeles County Department of Public Health. MAIN OUTCOME MEASURES: Fruit and vegetable and SSB consumption (number per week). STATISTICAL ANALYSIS: Data from the 2012 Los Angeles County Health and Nutrition Examination Survey were analyzed using multivariable regressions, with EBT access at farmers' markets as the primary independent variable. Covariates included EBT use, transportation behaviors, neighborhood attributes, and sociodemographic characteristics. RESULTS: A total of 1,503 adults participated in the survey (response rate=69%). Of these, 529 reported receiving EBT benefits. Among these benefits recipients, 64% were women, 54% were aged 25 to 44 years, 62% were black, and 75% were unemployed or part-time employed. In multivariable regression analyses, EBT access at farmers' markets was positively associated with higher fruit and vegetable consumption; however, an association to SSB consumption was not demonstrated. CONCLUSIONS: EBT access at farmers' markets is related to higher fruit and vegetable consumption among PHC clients in Los Angeles County. However, the finding of no association to SSB consumption raises important questions about the need for strategies to discourage EBT recipients' purchase of foods of minimal nutritional value in other venues that accept nutrition assistance program benefits.

Asian American mothers' perception of their children's weight: a comparison with other racial/ethnic groups in Los Angeles.

OBJECTIVE: While mother's perception of child's weight is important for the success of early childhood obesity prevention programs, few studies have examined that of Asian Americans. Our study examined their perception and compared it to that of mothers of other racial/ethnic groups. DESIGN: Cross-sectional study of 2,051 randomly selected mothers of children aged 2-5 years living in Los Angeles County who were enrolled in the Special Supplemental Nutrition Program for Women Infants and Children (WIC). MAIN OUTCOME MEASURE: The primary outcome was mother's perception of child's weight. RESULTS: We found that Asian American mothers were 2.12 (95% CI: 1.27-3.54) times as likely as Hispanic mothers to accurately perceive their children's weight, adjusting for child's age, sex and birthweight, and mother's age and education. However, this relationship disappeared after adjusting for mother's BMI. We did not find differences in perception of child's weight among non-Hispanic White, non-Hispanic Black and Hispanic mothers. CONCLUSION: It appears that Asian American mothers' increased accurate perception of child's weight status can be partially explained by their lower prevalence of obesity. Our findings suggest that early childhood obesity prevention programs should consider the weight status of mothers.

Influences of the neighbourhood food environment on adiposity of low-income preschool-aged children in Los Angeles County: a longitudinal study.

BACKGROUND: Few studies have examined the association between the food environment and adiposity in early childhood, a critical time for obesity prevention. The objective of this study was to examine the longitudinal association between neighbourhood food environment and adiposity among low-income preschool-aged children in a major metropolitan region in the USA. METHODS: The study sample was 32 172 low-income preschool-aged children in Los Angeles County who had repeated weight and height measurements collected between ages 2 and 5 years through a federal nutrition assistance programme. We conducted multilevel longitudinal analyses to examine how spatial densities of healthy and unhealthy retail food outlets in the children's neighbourhoods were related to adiposity, as measured by weight-for-height z-score (WHZ), while controlling for neighbourhood-level income and education, family income, maternal education, and child's gender and race/ethnicity. RESULTS: Density of healthy food outlets was associated with mean WHZ at age 3 in a non-linear fashion, with mean WHZ being lowest for those exposed to approximately 0.7 healthy food outlets per square mile and higher for lesser and greater densities. Density of unhealthy food outlets was not associated with child WHZ. CONCLUSIONS: We found a non-linear relationship between WHZ and density of healthy food outlets. Research aiming to understand the sociobehavioural mechanisms by which the retail food environment influences early childhood obesity development is complex and must consider contextual settings.

Immigrant enclaves and obesity in preschool-aged children in Los Angeles County.

While neighborhood environments are increasingly recognized as important contributors to obesity risk, less has been reported on the socio-cultural aspects of neighborhoods that influence obesity development. This is especially true among immigrants, who may lack the necessary language skills to navigate their new living environments. In this study, we tested the hypothesis that young children of immigrants would be at lower obesity risk if they lived in neighborhoods where neighbors share the same language and culture. Using 2000 Census data and 2003-2009 data from the Special Supplemental Nutrition Program for Women, Infants and Children in Los Angeles County, we examined the relation between BMI z-scores in low-income children aged 2-5 years (N = 250,029) and the concentration of neighborhood residents who spoke the same language as the children's mothers. Using multi-level modeling and adjusting for child's gender and race/ethnicity, household education, neighborhood socioeconomic status, and year the child was examined, we found that percent of neighborhood residents who spoke the same language as the child's mother was negatively associated with BMI z-scores. This relation varied by child's race/ethnicity and mother's preferred language. The relation was linear and negative among children of English-speaking Hispanic mothers and Chinese-speaking mothers. However, for Hispanic children of Spanish-speaking mothers the relation was curvilinear, initially exhibiting a positive relation which reversed at higher neighborhood concentrations of Spanish-speaking residents. Our findings suggest that living in neighborhoods where residents share the same language may influence obesity-related behaviors (namely diet and physical activity) possibly through mechanisms involving social networks, support, and norms.