The transition to parenthood (TTP) is a stressful life event for most couples. Therefore, the way both partners jointly cope with stress (i.e., dyadic coping) is important for the prevention of individual adjustment problems (e.g., depression). For dyadic coping to be effective in reducing depressive symptoms, efforts of both partners should be equal. However, many couples experience a decrease of equity in task division within the domestic sphere across the TTP. The current study investigates the equity of a specific skill within the 'relationship sphere', because similarly to a decreased equity in household and childcare, a decreased equity of dyadic coping is likely to be associated with poorer individual adjustment. We collected longitudinal self-report data on dyadic coping and depressive symptoms from 104 mixed-gender first-time parents (n = 208 individuals) from pregnancy until 40 weeks postpartum. We created an equity score for men and women that measured their perceived difference between received and provided dyadic coping. On average, women reported providing more and receiving less dyadic coping than men. While both genders agreed on this distribution, men did perceive a higher equity of dyadic coping than women. Furthermore, the decrease of equity perceived by women across TTP was not visible in men. In line with our assumptions based on the equity theory, perceived equity of dyadic coping was associated with depressive symptoms in a curvilinear manner: Decreases in women's perceived equity in either direction (over-or underbenefit) were associated with more depressive symptoms in women and their male partners. This association was found above and beyond the beneficial effect of dyadic coping itself. This implies that not only how well partners support each other in times of stress, but also how equal both partners' efforts are, is important for their individual adjustment across TTP.

The transition to parenthood (TTP) often is associated with declines in couple relationship satisfaction. The current study evaluated changes in three relationship behaviors, namely communication, dyadic coping and relationship self-regulation, across the TTP and the association of those behaviors with relationship satisfaction. One hundred and three couples completed questionnaires twice before and three times after the birth of their first child. Prenatally, all behaviors were stable, except negative communication that declined. Postnatally, positive relationship behaviors decreased in both genders, and negative communication increased in men. Negative behaviors were associated with relationship satisfaction throughout the TTP. Furthermore, relationship self-regulation strategies and males’ negative dyadic coping prospectively predicted male relationship satisfaction, while men’s supportive dyadic coping predicted female relationship satisfaction. Enhancing positive relationship behaviors through relationship education programs might help couples successfully adjust to parenthood.