Postpartum Depression May Break the Chain Between Prenatal Bonding and Mother–Baby Attachment

One of the most intimate promises in human development is the bond a mother forms with her unborn child—the quiet conversations, the gentle touches on the belly, the imagined face behind the ultrasound image. For decades, psychologists have assumed that this prenatal connection lays the emotional groundwork for the relationship a mother will have with her baby after birth. A new prospective cohort study from Brazil now complicates that comforting narrative in a striking way: the link between a mother’s bond with her fetus and her later bond with her infant appears to run almost entirely through her mental health, and specifically through the symptoms of postpartum depression.

The research, published in the journal Trends in Psychology, followed 366 women in Rio de Janeiro from pregnancy through the postpartum period between February 2016 and November 2019. The participants were recruited from two Family Health Strategy units serving a low-income area with one of the lowest Human Development Index rankings in the city, making the study a rare window into maternal bonding in a middle-income country—a population that has been conspicuously underrepresented in this field of research. Women were assessed at three points: twice during pregnancy, in the first and third trimesters, and once after childbirth.

To capture the emotional architecture of motherhood, the researchers deployed a battery of validated instruments. Mother–fetus bonding was measured in the third trimester using a 12-item Brazilian short version of the Maternal-Fetal Attachment Scale, which probes feelings of empathy, role-taking, and interaction with the unborn child. After birth, mother–baby bonding was assessed with the Brazilian version of the Postpartum Bonding Questionnaire, a 12-item tool covering lack of enjoyment, rejection and anger, and anxiety and risk of abuse, where higher scores signal a worse bond. Depressive symptoms were tracked with the Edinburgh Postnatal Depression Scale during pregnancy and again postpartum, alongside measures of social support and anxiety.

The analytical approach was rigorous. Rather than simply correlating variables, the team used structural equation modeling with a weighted least squares means and variance estimator, estimating direct, indirect, and total effects with standardized coefficients and standard errors derived from a bootstrap procedure with 5,000 resamples. Model fit was judged against conventional thresholds: comparative and Tucker-Lewis fit indices above 0.95 and a root mean square error of approximation below 0.06. This allowed the researchers to test not just whether prenatal bonding predicts postnatal bonding, but how that prediction operates.

The headline finding is a textbook case of full mediation. In a simple model considering only mother–fetus bonding and mother–baby bonding, the pathway between them was statistically significant, echoing the bulk of prior literature: women who felt more attached during pregnancy tended to report better bonds with their babies afterward. But when postpartum depression symptoms were introduced as a mediator, the direct pathway collapsed into statistical insignificance, with a standardized coefficient of −0.098 and a p-value of 0.152. The indirect effect, routed through depression, remained robust at −0.128 with a p-value of 0.006, and both legs of that indirect pathway were individually significant. In plain terms, the protective value of a strong prenatal bond seemed to reach the postpartum period only insofar as it kept depressive symptoms at bay.

The final theoretical model, which also accounted for confounding factors such as social support, age, paid work, prenatal anxiety, and satisfaction with pregnancy, achieved good fit indices, with an RMSEA of 0.028, a CFI of 0.945, and a TLI of 0.942. Within that model, the pathway from mother–fetus bonding to postpartum depression was significant, and the pathway from postpartum depression to mother–baby bonding was strong, with a standardized coefficient of 0.458 and a p-value below 0.001. Social support and younger maternal age were independently associated with better bonding, while prenatal depression symptoms, pregnancy anxiety, and pregnancy satisfaction shaped the prenatal bond itself.

The clinical implications are considerable. If postpartum depression is the gatekeeper through which prenatal attachment translates into postnatal attachment, then screening for and treating perinatal depression becomes not merely a mental health priority but a direct strategy for protecting the mother–infant relationship. In Brazil, where the most recent nationally representative study estimated a postpartum depression prevalence of 26.3 percent, and more recent samples have reported rates between roughly 18 and 21 percent, the stakes are high. The authors argue that tools such as the Edinburgh Postnatal Depression Scale could be embedded more systematically in prenatal and postnatal care within Brazil’s Unified Health System, particularly through the Family Health Strategy, to identify at-risk women early.

The researchers are careful about what their results do and do not prove. Statistical mediation, they stress, does not by itself establish causality, and because postpartum depression symptoms and mother–baby bonding were measured at the same follow-up, the direction of the association cannot be definitively determined. The literature suggests the relationship may well be bidirectional, with bonding difficulties also feeding depressive symptoms. Alternative pathways and unmeasured confounding cannot be excluded, and the authors frame their findings as evidence of a plausible explanatory route rather than a settled causal mechanism.

Limitations also temper the conclusions. The study population was socially vulnerable and drawn from a single urban area, limiting generalizability to other contexts. Women lost to follow-up had higher prenatal depression scores and lower education, which may have led the team to underestimate the mediating role of depression. All key constructs were measured by self-report, leaving room for social desirability bias. Still, the retention rate above 70 percent across three waves, the longitudinal design, and the sophisticated modeling give the findings unusual weight for research in this setting.

What emerges is a reframing of a familiar story. The bond a mother builds with her fetus matters, but it may not act as an unbroken bridge to the postpartum relationship; depression can sever that bridge. For clinicians, policymakers, and families, the message is both sobering and hopeful: a strong prenatal attachment is not a guarantee, but protecting maternal mental health in the weeks and months after birth may be the single most effective way to ensure that the love built during pregnancy survives into the demanding, transformative first months of a child’s life.

Subject of Research: The mediating role of postpartum depression symptoms in the relationship between mother–fetus bonding and mother–baby bonding

Article Title: The Mediating Role of Maternal Postpartum Depression Symptoms in the Relationship Between Mother–Fetus Bonding and Mother–Baby Bonding: A Prospective Cohort Study in Brazil

Article References: Baldisserotto, M. L., Theme-Filha, M. M., Fraga, A. C. S. A., & Papaterra, M. (2026). The Mediating Role of Maternal Postpartum Depression Symptoms in the Relationship Between Mother–Fetus Bonding and Mother–Baby Bonding: A Prospective Cohort Study in Brazil. Trends in Psychology. https://doi.org/10.1007/s43076-026-00532-9

Image Credits: AI Generated

DOI: 10.1007/s43076-026-00532-9

Keywords: postpartum depression, mother-baby bonding, mother-fetus bonding, prenatal attachment, maternal mental health, structural equation modeling, Brazil, cohort study, Edinburgh Postnatal Depression Scale, perinatal care, attachment theory, public health