October 30, 2026
Does depression in pregnancy affect a baby’s brain? A birth trauma and baby loss therapist explains what research says, what it doesn’t, and why support matters.
Many pregnant people ask me some version of this question: does maternal mental health affect baby brain development? If you have been struggling with depression, anxiety or the aftermath of a traumatic experience, it is one of the most painful worries to carry, and it is often carried in silence.
Here is the honest short answer. Research does show an association between mental health in pregnancy and differences in infant brain structure. But the findings are mixed, they describe groups of babies rather than any individual child, and they do not show that you have harmed your baby. A recent trial also suggests that treating depression in pregnancy is associated with measurable differences in infant brain structure. That is a hopeful finding, although it needs to be read carefully.
In this article I will explain what the research shows, what it does not show, and what it means if you are pregnant and finding things hard. None of this is your fault, and support is available.
Depression is one of the most common complications of pregnancy. A 2026 paper reports that 20–40% of people experience elevated depressive symptoms during pregnancy, with higher rates among those facing financial and social disadvantage (Demers et al., 2026). If you are in that group, you are far from alone.
Researchers have long suspected that the environment before birth can shape development. But most of the research so far has been correlational. It could not rule out genetics, socioeconomic context or the environment after birth. That is why a randomised trial matters. It is a much stronger way to ask whether treating a problem changes what researchers see in babies.
It is also worth saying something that is easy to lose in a discussion of baby brains: treating depression in pregnancy matters because you matter. Your wellbeing is important in its own right, whatever any scan study finds.
Researchers have scanned the brains of babies, children and young adults whose mothers had depression in pregnancy and compared them with those whose mothers did not. Some found small differences in certain brain areas. But the results don’t line up. The differences showed up in different areas in different studies, sometimes only in boys or only in girls, and some studies found no difference at all. Several were small.
Two larger studies followed children into adolescence and adulthood. One, following more than 2,800 mother–child pairs, found that depression symptoms in pregnancy, but not after birth, were linked to differences in how brain networks were connected in the teenage years (Koc et al., 2025). The other found differences from typical development in both directions, with some brain areas smaller and some larger (Mareckova et al., 2025).
What all of these studies share is that they look at groups, not individual children, and they can’t separate the effect of depression from genetics, circumstances and life after birth.
The strongest evidence comes from a trial in which pregnant people with depression were randomly assigned to one of two groups (Demers et al., 2026). One group had a short course of interpersonal therapy (eight weekly sessions). The other had usual care plus an information session and ongoing monitoring.
The therapy worked for the parents. By the end of pregnancy, around 6% of the therapy group still met the criteria for major depression, compared with around 26% of the usual care group.
Researchers then scanned the brains of 109 of the babies. They found one clear difference. Babies whose mothers had therapy had a slightly smaller right hippocampus (a brain area involved in memory and stress) than the comparison group. There was no difference in the left hippocampus or in the amygdala (an area involved in processing emotion).
“Smaller” can sound alarming, so it’s worth being clear about what the authors say. They describe a difference, not damage and not an improvement. One possibility they raise is that stress in pregnancy may speed up the development of some brain areas, and that treating depression may bring development back towards a more typical pace. That is a hypothesis, not an established fact. They call the infant findings exploratory, and they say the reasons behind them and their long-term significance are not yet known.
What it suggests:
What it does not mean:
It is also not about blame. Mental health difficulties in pregnancy are common, often shaped by things well outside anyone’s control, and nobody chooses them. If you are reading this feeling guilty, I would gently encourage you to treat the research as a reason to be kind to yourself and to ask for support, not as a verdict.
It is important to be clear about the limits of this evidence:
If you are pregnant and experiencing depression, anxiety or the effects of trauma, this research is not a reason to panic. It is a reason to reach out, because help is effective and you deserve it. In the trial, a brief, non-invasive talking therapy substantially reduced depression before birth. In the UK, NICE guidance on antenatal and postnatal mental health recommends that psychological therapies are offered to people with mental health difficulties in pregnancy.
Consider speaking to a professional if you notice:
There is no research suggesting it is too late to benefit from support at any stage of pregnancy, or afterwards. If you are wondering whether what you experienced in a previous birth counts as trauma, my guide Do I Have Birth Trauma? may help.
A note on medication. One small study found no link between SSRI exposure in pregnancy and differences in infant brain volumes (Sethna et al., 2021). Because it was a small sample, it cannot establish that antidepressants are safe, and a decision should never be based on one study. Untreated depression also carries risks of its own, for you and for your baby, so the choice involves weighing benefits and risks. Please make decisions about medication with your GP, midwife or perinatal psychiatrist, and do not stop a prescribed medication suddenly without advice.
If you are in crisis or having thoughts of harming yourself: please contact your GP, call NHS 111 (and choose the mental health option), or call Samaritans free on 116 123 at any time. Call 999 or go to A&E if you are in immediate danger.
After birth, seek urgent help if you or someone close to you notices confusion, a very elevated or very low mood, seeing or hearing things that others do not, or feeling suspicious or unlike yourself. These can be signs of postpartum psychosis, which is a medical emergency and treatable. Call 999 or go to A&E.
Other sources of support in the UK:
As a birth trauma therapist in Bristol, I regularly work with pregnant clients. Therapy in pregnancy is adapted in specific ways:
This is not a one-size-fits-all approach. Your stage of pregnancy, your stability, your history and your preferences all shape the work. Some people also find peer support groups and specialist perinatal mental health teams helpful alongside therapy, though these were not tested in the research discussed here.
If you would like to know more about the type of therapy used in the trial, I explain it in What Is IPT? Interpersonal Therapy for Grief, Loss and Life Transitions.
Research shows an association between prenatal depression and differences in infant brain structure, but it does not show that depression causes lasting harm. Results vary between studies, the differences are small and found at group level, and they cannot predict how an individual child will develop. Most children whose mothers experienced depression in pregnancy do well. Getting support matters for you in its own right.
No. There is no research suggesting it is too late, and support can help at any stage of pregnancy and after birth. If you are struggling now, speaking to a professional is worthwhile.
There is no evidence that talking therapy harms babies, and it is a recommended treatment for depression in pregnancy. The 2026 trial found that babies whose mothers had a brief therapy (IPT) differed from the comparison group in right hippocampal volume. The authors describe this as an exploratory finding and say the reasons and long-term significance are unknown. It is not evidence that therapy “improves” or “harms” a baby’s brain.
This is a decision to make with your GP, midwife or perinatal psychiatrist, weighing the risks of treatment against the risks of untreated illness. One small study found no link between SSRI exposure and infant brain volumes, but it is not a basis for changing treatment.
Yes. In one large study, postnatal depressive symptoms were not significantly linked to differences in teenage brain connectivity, but that is one finding about one outcome. Postnatal mental health matters for your wellbeing, for your relationship with your baby and for many other reasons. Support should never be withheld on the basis of this finding.
Not directly. The trial discussed here was about depression. There is currently little research on trauma treatment in pregnancy and infant brain development, so I cannot say what the evidence shows in that area. This is why individual assessment matters.
I work with pregnant and postnatal clients who are navigating exactly these questions, often carrying a quiet worry about whether their mental health is affecting their baby. Whatever you are feeling, it is not a failing, and support is available.
If you would like to talk things through, you are welcome to book a free 15-minute consultation. There is no pressure to commit.
Related reading: Is EMDR Safe in Pregnancy? · Do I Have Birth Trauma? · What Is IPT?
This article is for general information and education only. It is not a substitute for individual clinical advice, diagnosis or treatment. If you are concerned about your mental health or your baby’s health, please speak to your GP, midwife or another qualified professional.
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