Therapy for depression in pregnancy left infants with a 5% hippocampal difference in a randomized trial
Catherine Demers and colleagues report a 5% hippocampal difference in infants whose mothers received psychotherapy for prenatal depression, versus usual care. Randomization covers the therapy-to-brain step only; the tie to infant emotion is an association.
The Scientist · Science desk
Three figures: eight weekly 50-minute sessions come to 400 minutes of scheduled therapy, about 6.7 hours; babies whose mothers received treatment showed a 5% difference in their hippocampus compared with usual care; prenatal depression affects an estimated 20% to 40% of pregnant individuals.
| Figure | Value | Note | Claim |
|---|---|---|---|
| Scheduled therapy, eight weekly 50-minute sessions | 400 minutes | about 6.7 hours | 10 |
| Babies' hippocampus, mothers treated | 5% difference | compared with usual care | 4 |
| Pregnant individuals with prenatal depression, estimated | 20% at least | up to 40% | 7 |
What happened
- The researchers describe the Care Project as the first randomized controlled trial to show that a prenatal depression intervention can affect infant brain structure.
- The therapy arm got interpersonal psychotherapy: eight weekly 50-minute sessions focused on relationships and social support.
- The comparison arm got enhanced usual care: standard obstetric care, one psychoeducation session on depression in pregnancy, and information on community mental health resources.
- The hippocampus, a region involved in memory and emotions, predicted better emotion regulation in the babies at 6 months of age.
Why it matters
- What it limits constraint The comparison arm had one psychoeducation session against eight therapy sessions, so the trial cannot say whether the content of interpersonal therapy or the contact itself produced the difference.
- Who has to decide decision Clinics sizing a prenatal referral pathway can plan around 400 minutes of scheduled therapy per participant, about 6.7 hours.
- Who's exposed exposure If the result replicates, it bears on a large group of pregnancies, since prenatal depression is estimated to affect 20% to 40% of pregnant individuals.
Random assignment is the piece earlier work on this question lacked. "Research has long shown that depression during pregnancy is associated with differences in children's emotional and behavioral outcomes, but most of that evidence has been correlational," said Catherine Demers, assistant professor of psychiatry at the University of Colorado Anschutz and lead author [8]. In the Care Project, pregnant participants with elevated depressive symptoms were randomly assigned to therapy or usual care [1]. The two groups should therefore differ, on average, mainly in what they were assigned, and a group difference in infant hippocampus can be attributed to the treatment.
Randomization stops at that step. The brain difference was associated with lower negative emotionality in infancy [6], and the region predicted better emotion regulation at 6 months [5]. Both findings describe how outcomes line up with each other inside the trial. The trial cannot show whether the hippocampal difference mediates the emotional benefit or is only correlated with it.
Medical Xpress's account of the 5% figure [4] does not report the number of mother-infant pairs, whether the hippocampus was larger or smaller in the therapy group, or how negative emotionality was measured. Until those are on the table, the size of the effect and its clinical meaning are open.
On the published summary, we think the trial supports the claim that a short course of therapy in pregnancy can reach infant brain structure. The evidence that it changes how babies fare is thinner. Elysia Davis, professor of psychology at the University of Denver and corresponding author, said: "Our findings suggest that treating a mother's depression during pregnancy may help shape a healthier developmental trajectory for the infant brain," [9].
What to watch
- The full paper's sample size, the direction of the hippocampal difference, and how negative emotionality was measured.
- Follow-up of these infants past 6 months, to see whether the hippocampal and emotional differences persist.
- An analysis or trial that tests whether the hippocampal difference accounts for the emotional difference, ideally with a comparison arm matched for contact time.
Clarity's read
What the record supports and how the coverage leans. The claims behind it follow.
Reality
- Evidence50
- Adoption
- Not scored
- Hype gap+30
- Incentives
- Not scored
- Confidence40
Claim ledger
Ranked by verification strength, evidence, and original report placement.
- [1]
The Care Project was a randomized clinical trial involving pregnant individuals experiencing elevated depressive symptoms.
- [2]
The therapy arm received a form of interpersonal psychotherapy consisting of eight weekly 50-minute sessions focused on relationships and social support.
- [3]
The comparison arm received enhanced usual care: standard obstetric care, a psychoeducation session about depression during pregnancy and information about community mental health resources.
- [4]
Babies whose mothers received treatment showed a 5% difference in their hippocampus compared with those whose mothers received usual care.
- [5]
The hippocampus, a brain region involved in memory and emotions, predicted better emotion regulation when babies were 6 months of age.
- [6]
The brain differences in infants of mothers who received psychotherapy were associated with lower negative emotionality in infancy.
- [7]
Prenatal depression affects an estimated 20% to 40% of pregnant individuals.
- [8]
"Research has long shown that depression during pregnancy is associated with differences in children's emotional and behavioral outcomes, but most of that evidence has been correlational," said Catherine Demers, Ph.D., assistant professor of psychiatry at the University of Colorado Anschutz and lead author.
- [9]
"Our findings suggest that treating a mother's depression during pregnancy may help shape a healthier developmental trajectory for the infant brain," said Elysia Davis, Ph.D., professor of psychology at the University of Denver and the SEED Research Institute and corresponding author.
- [10]
Eight weekly 50-minute sessions come to 400 minutes, about 6.7 hours of scheduled therapy.
- [11]
Researchers describe the Care Project as the first randomized controlled trial to demonstrate that a prenatal depression intervention can affect infant brain structure.
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Sources
1 independent publisher whose own reporting we read for this story.
- Depression treatment during pregnancy may benefit babies' brain development, randomized trial finds
medicalxpress.com
1 article · October 16, 2026
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Topics
- Prenatal depressionFollow
- Randomized controlled trialsFollow
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