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Rapid changes in American families have reshaped inequalities in child well-being. This paper examines the unequal consequences of family structures for infant health, focusing on birthweight. Existing studies mainly address the average association between marriage (versus singlehood) and birthweight. I extend the literature by 1) explicitly considering cohabitation and 2) exploring the heterogeneous associations based on mother's likelihood of union formation at conception. Pooling nationally representative data from the National Survey of Family Gro wth 2011-17, I analyze a sample of recent births (N = 4,376) born to mothers aged between 20 and 49 years. Propensity score methods are used to address selections. Results show that 1) compared to single mothers, married mothers reap birthweight benefits, while cohabiting mothers do not; 2) married mothers with a higher likelihood to marry at conception (i.e., more advantaged) reap even larger birthweight benefits than their low-likelihood counterparts (i.e., less advantaged). Overall, the findings reveal important and nuanced roles of family structure in the reproduction of intergenerational inequality through infant health. [ABSTRACT FROM AUTHOR]

This paper presents a search-theoretic model of union formation among women, aged 55 and older. Specifically, it provides new estimates of gender differentials in cohabitation and marriage at older ages, and documents recent patterns of assortative mating using data from the 2008–2017 American Community Survey. Our analyses reveal that cohabitation represents a much smaller share of all older unmarried women, all partnered women, and all women in comparison to patterns observed among their male counterparts. The results also reveal highly uneven patterns of union formation by age, race and marital history, which reflect demographically uneven constraints and preferences. Our analyses also document, for the first time, patterns of assortative mating at older ages. Shortages of similarly-aged men, especially among older African American women, seemingly heighten the likelihood of demographically mismatched unions. Older women are less likely to form unions with same-race or economically attractive partners, defined as men having a college-degree. This study shows that older single women, in general, are at a comparative disadvantage in the marriage market, both in forming co-residential unions and in finding partners who match their own social, demographic, and economic profiles. This paper highlights considerable heterogeneity in the experiences of America's older women. It calls for new theoretical approaches that acknowledge the unequal resources and bargaining power among older women in the marriage market. [ABSTRACT FROM AUTHOR]