New Jersey Record-Linkage Study Associates Postpartum Depressive Symptoms with 3.6-Fold Adjusted Infant Mortality Risk

The Rutgers-led analysis merged mandatory hospital screening data from New Jersey birth certificates with death records through 2021. After adjustment for maternal race, education, insurance, and infant gestational age, the hazard ratio remained 2.9. Elevated risks appeared for prematurity-related deaths, SIDS, and congenital anomalies, suggesting multiple pathways rather than a single mechanism. The universal screening mandate allowed capture of symptomatic but undiagnosed mothers, reducing selection bias common in clinically ascertained cohorts.

Observational designs cannot separate causation from confounding by unmeasured social determinants or reverse causation when severe infant illness precipitates maternal symptoms. Prior cohort studies in The Lancet and Pediatrics have shown similar associations with preterm birth and reduced breastfeeding, yet few have linked symptoms directly to post-neonatal mortality. The present work extends those findings by demonstrating consistency across term and preterm strata and across racial and payer groups.

Policy implications center on closing the screening-to-treatment gap highlighted by ACOG guidelines. New Jersey’s data show screening alone does not alter mortality trajectories; scalable interventions such as stepped-care psychotherapy and home-visiting programs require evaluation in pragmatic trials. Future studies must incorporate longitudinal mental-health service utilization and objective measures of infant care quality to test whether treating maternal symptoms reduces the observed mortality differential.

Remaining questions include whether the association persists beyond the first year and how state-level variation in mental-health access modifies the relationship. Randomized trials linking depression treatment to infant survival endpoints are now ethically and logistically feasible given the strength of the signal.