Men’s working-time flexibility and transition to 2nd birth: Evidence for couples in Germany

Advances in information and communication technologies have accelerated the diffusion of flexible working-time arrangements, with important implications for work–family reconciliation and fertility. Yet flexible schedules are not uniform. Employee-oriented flexibility, which grants workers control over when they work, differs fundamentally from employer-oriented flexibility, characterised by unpredictable hours and employer-driven schedule changes. These forms are unevenly distributed across social groups and may have contrasting consequences for family formation. While previous research has focused largely on women and employee-oriented flexibility, much less is known about how men’s working-time flexibility—particularly employer-oriented forms—shapes fertility behaviour. This paper examines the association between fathers’ working-time flexibility and the transition to a second birth in Germany. Using longitudinal data from the German Socio-Economic Panel (SOEP) for 2003–2019 and applying event history analysis, we analyse couples with one child, adopting a couple-level perspective that accounts for mothers’ employment status and schedule flexibility. The results show no overall association between men’s flexible schedules and second births in baseline models. However, important heterogeneity emerges once a couple’s characteristics are considered. Among dual-earner couples, fathers’ employer-oriented working-time flexibility significantly reduces the likelihood of a second birth, particularly when mothers have fixed schedules. In contrast, employee-oriented flexibility is positively associated with second births, but only in male breadwinner couples. Further analyses reveal that these relationships also vary by men’s socio-economic status. Overall, the findings highlight the importance of distinguishing between types of flexibility and considering couple-level contexts when assessing how labour market changes influence fertility.