We study how fathers’ access to workplace flexibility affects maternal postpartum health. We use variation from a Swedish reform that granted new fathers more flexibility to take intermittent parental leave during the postpartum period and show that increasing the father’s temporal flexibility reduces the incidence of maternal postpartum physical and mental health complications. Our results suggest that mothers bear the burden from a lack of workplace flexibility for men because fathers’ inability to respond to domestic shocks exacerbates the maternal health cost of childbearing.