Maternal oxytocin predicts relationship survival during the perinatal transition period: Preliminary evidence.

It is well-known that the neuropeptide oxytocin plays a critical role regulating the formation of adult-adult pairbonds in non-human animals, and recent work suggests oxytocin may similarly play an important role in romantic bonding in humans. Specifically, endogenous oxytocin is predictive of a host of relationship-enhancing behaviors, relationship quality, and even relationship survival amongst newly dating couples. This work suggests that oxytocin can buffer romantic relationships, possibly during especially difficult transition periods. One challenge that many couples face is the birth of a child: a joyous event, but one that is recognized as a major life stressor nonetheless. We aimed to investigate whether maternal oxytocin buffers the parent-partner relationship during the perinatal transition period. To test this, we analyzed data from a longitudinal study of child-bearing women (N = 269) in which endogenous oxytocin was measured in blood plasma during the 1st and 3rd trimesters and at 7-9 weeks postpartum; relationship status was assessed at the outset and 2.5 years postpartum. As predicted, lower maternal oxytocin was associated with greater risk for relationship dissolution by the time the child was a toddler (p < .05). These findings directly replicate research showing that endogenous oxytocin predicts relationship survival in dating couples, but in a novel interpersonal context. That said, only a very small number (N = 7) of couples separated; this, of course, is unsurprising given that the perinatal transition period is not a time when couples typically choose to terminate their relationship. Nonetheless, these findings must be considered preliminary until replicated in future research.