Income Instability During Pregnancy Prospectively Relates to Postpartum Brain Function for Parent-Infant Bonding

Pregnancy represents a critical period of neuroplasticity when environmental stressors can disrupt the neurobiological foundations of parent-infant bonding, with lasting consequences for perinatal mental health. While chronic poverty has been linked to adverse parenting outcomes, the specific impact of income instability during pregnancy on parental brain adaptation remains unknown.

We examined whether prenatal income changes prospectively influence neurobiological responses to infant distress cues among birthing individuals (N = 120) during the early postpartum period. Monthly income data across pregnancy were used to compute income-to-needs ratio (INR), income losses, and income gains. Participants underwent functional magnetic resonance imaging while listening to their own and a control infant's cry and matched white noise.

Income losses during pregnancy were associated with dampened brain responses to infant cry across motor, auditory, and empathy-related cortices-a pattern consistent with impaired caregiving sensitivity and known risk factors for postpartum depression. These neurobiological alterations were paralleled by elevated prenatal depression and anxiety symptoms. In contrast, income gains were associated with greater activation in response to one's own infant's cry in prefrontal regions involved in cognitive empathy and emotion regulation and were linked to stronger postnatal attachment bonds.

These findings suggest that prenatal income instability is associated with variation in postpartum brain responses within circuits relevant to caregiving and parent-infant bonding. The associations between prenatal income loss and prenatal mood symptoms also suggest that screening for economic instability during routine prenatal care may help identify families who could benefit from additional support, including mental health resources.