A Research Note on the Stability of Coresidential Unions Formed Postconception.

There is a large literature examining the stability of mid-pregnancy unions, and parallel work on unions formed after a nonmarital birth, but research has yet to compare pre- and post-birth unions and simultaneously consider whether the union is with the father or a new partner. Using the National Longitudinal Survey of Youth, 1997 Cohort, the author compares the stability of coresidential unions (cohabitations and marriages) among three groups of mothers with non-union first conceptions: those with a mid-pregnancy union with the father (N = 203), those with a post-birth union with the father (N = 333), and those with a union with a new partner (N = 342). Compared to mid-pregnancy unions with the father, post-birth father unions are 35% more likely to dissolve. New-partner unions are more likely to dissolve than both types of father unions. These associations persist when accounting for union type and socioeconomic and demographic characteristics.