When a New Mother Is Struggling: What a Big New Study Tells Us About Postpartum Depression and Infant Health

Understanding a New Jersey Study That Linked Depression Screening Records to Infant Survival

Having a baby is one of the most emotionally intense experiences a person can go through, and it is completely normal for new mothers to feel overwhelmed, tearful, or exhausted in the first weeks after birth. But for some mothers, those feelings don't fade — they deepen into postpartum depression, a real medical condition that affects how a mother feels, thinks, sleeps, and bonds with her baby. Because a mother's wellbeing and her baby's wellbeing are so closely connected in the first year of life, researchers have long wondered whether postpartum depression might also carry risks for the baby, not just the mother. A large new study offers some of the clearest evidence yet on that question — and its findings, while sobering, come with important context that should reassure rather than alarm families [1].

A Brief History: How We Got to Routine Depression Screening

For a long time, postpartum depression was poorly understood and rarely talked about. Many mothers who struggled emotionally after childbirth were told it was "just the baby blues" and would pass on its own, and there was no standard, reliable way for a doctor or nurse to check how a new mother was really doing. That began to change in 1987, when researchers Cox, Holden, and Sagovsky created the Edinburgh Postnatal Depression Scale (EPDS), a simple 10-question survey that gave health care providers, for the first time, a quick and validated way to screen for depressive symptoms after birth [2]. Over the following decades, research accumulated showing that a mother's mental health during and after pregnancy could genuinely affect her child — including a major 2014 review that summarized wide-ranging effects on children's development [3], and a 2010 analysis showing that depression during pregnancy was linked to a higher chance of babies being born early or at a low birth weight [4]. This evidence eventually convinced national health authorities that screening shouldn't be optional or left to individual doctors' judgment. In 2019, the US Preventive Services Task Force (USPSTF), a national panel of experts that sets screening guidelines, formally recommended that every pregnant and postpartum person be screened for depression [5], and government health tracking in 2020 confirmed what many suspected: a large share of mothers with depressive symptoms never actually talked to a health care provider about how they were feeling [6]. New Jersey became one of the first states to turn this into law, requiring hospitals to screen every new mother before she goes home [7] — though an earlier look at New Jersey's own program found that simply requiring screening did not automatically mean mothers received treatment afterward, a gap that still matters today [8]. It is this same statewide screening system, now used at nearly every New Jersey hospital, that made the new study possible.

What the Researchers Did

A team from Rutgers, Princeton, and the University of California, San Francisco used a clever approach: instead of running a new study from scratch, they used records that New Jersey hospitals already collect. Every mother who gives birth in New Jersey is screened with the same EPDS depression questionnaire before she leaves the hospital, and a score of 10 or higher is treated as a positive screen for depressive symptoms. The researchers took those screening records for nearly 415,000 babies born between 2016 and 2020 and — with careful privacy protections in place — matched them anonymously to state death records, to see whether babies of mothers who screened positive were more likely to die before their first birthday than babies of mothers who did not. Because the researchers were comparing existing groups rather than assigning anyone to a "depressed" or "not depressed" group, they also carefully adjusted their comparison to account for many other factors that can affect a baby's health, such as the mother's age, education, income, insurance status, and whether it was her first baby, so that the comparison would be as fair as possible.

What They Found

Among mothers who screened positive for depressive symptoms — about 4 in every 100 mothers in this study — babies were roughly three times as likely to die before their first birthday, even after researchers accounted for the other factors mentioned above. It is important to look closely at what that means in real numbers, because relative risk (a multiple, like "three times higher") can sound much scarier than the actual chances involved. In absolute terms, about 7 babies out of every 1,000 born to mothers with depressive symptoms died in their first year, compared with about 2 babies out of every 1,000 born to mothers without depressive symptoms. Both of these numbers are low. The overwhelming majority of babies in both groups — more than 99% — survived their first year safely. What the study shows is a meaningful difference in a rare event, not a high-probability outcome for any individual family. The researchers also looked at causes of death and found that the increased risk showed up across several different categories, including complications related to premature birth, other conditions present around the time of birth, birth defects, and sudden infant death syndrome (SIDS) — a sleep-related cause of death that safe-sleep practices (like placing babies on their backs, alone, in an empty crib) are specifically designed to reduce [9].

What This Means for Families

If you or someone you love screens positive for postpartum depression, this study is not a prediction about your baby. It is a reminder that mental health support during and after pregnancy genuinely matters — for you and for your baby's wellbeing. It can be unsettling to read about "three times higher risk," so it is worth repeating: the vast majority of babies in this study, in both groups, thrived through their first year. What changed was not the outcome for any one family, but the strength of the signal researchers could detect when looking across hundreds of thousands of families at once — the kind of signal that helps hospitals and policymakers decide where to invest in support, not the kind of signal that should keep any individual parent up at night. A few things are worth keeping in mind:

  • A positive screen is a starting point for support, not a diagnosis of danger. Depression is treatable, and effective options — including therapy, support groups, and medication when appropriate — exist and help most people who use them.
  • Honesty with your care team matters. Screening only works if mothers feel safe answering truthfully. If a screening question makes you nervous, ask your provider what happens next and what support is available — you have a right to know.
  • This is population-level science, not a crystal ball. Researchers studied patterns across hundreds of thousands of families to learn something true about groups of people; it cannot tell you what will happen to your specific baby.
  • You are not alone, and this is not your fault. Postpartum depression is a medical condition, not a personal failing, and reaching out for help is a sign of strength, not weakness.

For families whose baby is in the neonatal intensive care unit (NICU), the emotional toll on parents can be especially intense, and In[Neo]Sight has separate coverage of parental mental health during a NICU stay that may also be useful.

The Bigger Picture and What Comes Next

Before routine screening existed, countless mothers suffered silently, without a name for what they were feeling or a clear path to help — and their babies may have missed out on the extra support that comes when a struggling parent is identified early. This study is part of a broader, decades-long effort to change that, and its findings add urgency to an already-strong case for a message researchers have been building for years: expanding depression screening and — just as importantly — making sure treatment is actually accessible afterward could be a meaningful, modifiable way to protect both mothers and babies [8]. This lines up with other recent research showing that states with stronger postpartum depression laws tend to see better maternal health outcomes overall, suggesting that policies like New Jersey's screening mandate may have benefits that ripple outward to the whole family, not just the person being screened [10]. It's also worth placing these numbers in the context of infant health nationally: government tracking of infant deaths across the entire country shows that most babies in the United States survive their first year safely, and the numbers in this New Jersey study — even in the higher-risk group — remain consistent with that broader picture of a generally low-risk first year of life [11]. Researchers are now working on next steps, including studying whether babies whose mothers receive treatment for depression have better outcomes than those who don't, testing whether similar patterns hold up in other states, and exploring the many overlapping challenges new mothers face — for instance, difficulties with breastfeeding are themselves linked to depressive symptoms in both directions, suggesting that support for feeding and support for mental health may need to go hand in hand [12]. In the meantime, the clearest, most empowering takeaway for any family is simple: postpartum mental health is not a side issue in newborn care — it is part of it, and asking for help is always the right call.

References

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  2. Cox JL, Holden JM, Sagovsky R. Detection of postnatal depression. Development of the 10-item Edinburgh Postnatal Depression Scale. British Journal of Psychiatry. 1987;150(6):782-786. doi:10.1192/bjp.150.6.782 ↩
  3. Stein A, Pearson RM, Goodman SH, et al. Effects of perinatal mental disorders on the fetus and child. The Lancet. 2014;384(9956):1800-1819. doi:10.1016/S0140-6736(14)61277-061277-0) ↩
  4. Grote NK, Bridge JA, Gavin AR, Melville JL, Iyengar S, Katon WJ. A meta-analysis of depression during pregnancy and the risk of preterm birth, low birth weight, and intrauterine growth restriction. Archives of General Psychiatry. 2010;67(10):1012-1024. doi:10.1001/archgenpsychiatry.2010.111 ↩
  5. US Preventive Services Task Force, Curry SJ, Krist AH, Owens DK, et al. Interventions to Prevent Perinatal Depression: US Preventive Services Task Force Recommendation Statement. JAMA. 2019;321(6):580-587. doi:10.1001/jama.2019.0007 ↩
  6. Bauman BL, Ko JY, Cox S, et al. Vital Signs: Postpartum Depressive Symptoms and Provider Discussions About Perinatal Depression — United States, 2018. MMWR Morbidity and Mortality Weekly Report. 2020;69(19):575-581. doi:10.15585/mmwr.mm6919a2 ↩
  7. Rowan PJ, Duckett SA, Wang JE. State Mandates Regarding Postpartum Depression. Psychiatric Services. 2015;66(3):324-328. doi:10.1176/appi.ps.201300505 ↩
  8. Kozhimannil KB, Adams AS, Soumerai SB, Busch AB, Huskamp HA. New Jersey's Efforts To Improve Postpartum Depression Care Did Not Change Treatment Patterns For Women On Medicaid. Health Affairs. 2011;30(2):293-301. doi:10.1377/hlthaff.2009.1075 ↩
  9. Moon RY, Carlin RF, Hand I; Task Force on Sudden Infant Death Syndrome and the Committee on Fetus and Newborn. Sleep-Related Infant Deaths: Updated 2022 Recommendations for Reducing Infant Deaths in the Sleep Environment. Pediatrics. 2022;150(1):e2022057990. doi:10.1542/peds.2022-057990 ↩
  10. McCoy-White J, Chukwuorji JC, Farooq S, et al. Association of state postpartum depression legislation and maternal mortality in the United States. Frontiers in Public Health. 2026;14:1625860. doi:10.3389/fpubh.2026.1625860 ↩
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