Some Postpartum Depression Can Be Prevented, and Some Cannot
On the feeding question specifically, see breastfeeding and postpartum depression.
There is real evidence that postpartum depression can be prevented — but it is narrower than most articles on this subject suggest, and it applies to a specific group of people.
The US Preventive Services Task Force recommends that clinicians provide or refer pregnant and postpartum people who are at increased risk of perinatal depression to counseling. That is a grade B recommendation, meaning the evidence supports it with moderate certainty. It is a recommendation about prevention, aimed at people with risk factors — not a suggestion that everyone needs therapy, and not advice about treating depression that has already started.
Here is what that looks like in practice. Among the people studied in those trials — all already carrying a risk factor — about 19 in 100 developed perinatal depression under usual care. With a short course of counseling, about 12 in 100 did. Roughly seven fewer cases per hundred at-risk people.
That is a genuine effect and worth having. It is also not a guarantee, and the rest of this page is about being straight on where the line falls.
There Is No Test That Tells You Whether You Are at Risk
This is the first thing the Task Force says, and it is worth repeating because it is so often glossed over: there is no accurate screening tool for identifying who is at risk of perinatal depression.
What exists instead is a pragmatic list, drawn from who was actually enrolled in the trials that worked. You may be considered at increased risk if you have:
- A history of depression
- Current depressive symptoms that do not yet meet a diagnostic threshold
- Certain socioeconomic factors — low income, adolescent parenthood, or single parenthood
- Recent intimate partner violence
- Elevated anxiety symptoms, or a history of significant negative life events
That is a clinical rule of thumb, not a validated instrument. If one or more of these describes you, that is reason enough to ask your obstetrician, midwife or primary care provider about preventive counseling — before anything is wrong.
Two Programs Have the Strongest Evidence Behind Them
When the Task Force looked at which specific programs worked, two stood out. Both are short, structured, and designed to be delivered to groups.
ROSE Is Built on Interpersonal Therapy
ROSE — Reach Out, Stay Strong, Essentials for mothers of newborns — was developed for pregnant women on public assistance. In the larger of its two foundational trials, 99 at-risk women were randomized: within three months of delivery, 20% of those receiving standard antenatal care developed postpartum major depression, compared with 4% of those who received ROSE.
An earlier pilot of 35 women found an even larger difference, but with 17 people in one arm, that result is too small to lean on by itself. Pooled across trials, the Task Force found ROSE associated with roughly a 50% reduction in relative risk.
Mothers and Babies Is Built on Cognitive Behavioral Therapy
The Mothers and Babies Course teaches mood-management skills — tracking how activities and thoughts affect mood, and building more of what helps. In its foundational trial of 78 low-income women in home-visiting programs, 15% of those who received the course had a major depressive episode by six months, compared with 32% of those who did not.
Both programs have been studied mainly in low-income US populations, often delivered through home visiting or community agencies. That is a strength — these are the populations most often left out of trials — but it does mean the evidence is strongest for the settings where they were tested.
What the Evidence Does Not Support
This section matters more than the last one, because these are the things people are most often told to do.
Omega-3 Supplements Did Not Work in the Largest Trial
The DOMInO trial gave DHA-rich fish oil to pregnant women and followed 2,399 of them. The proportion with high levels of depressive symptoms in the first six months postpartum was 9.67% in the DHA group and 11.19% in the control group — a difference that did not reach statistical significance. The Task Force’s own evidence review reached the same conclusion: omega-3 fatty acids are not effective at preventing perinatal depression.
Vitamin D Is an Association, Not a Proven Intervention
Several studies find that lower vitamin D levels correlate with more postpartum depressive symptoms. No randomized trial has shown that taking vitamin D prevents postpartum depression. Researchers in this area say so themselves and call for exactly that trial to be done. Correcting a deficiency is reasonable for other reasons; preventing depression is not an established one.
Eating the Placenta Has No Evidence of Benefit and a Documented Harm
A review in the American Journal of Obstetrics and Gynecology found no scientific evidence of any clinical benefit from placentophagy in humans. It also noted a case in which a newborn developed recurrent group B streptococcal sepsis after the mother took contaminated placenta capsules, which prompted a CDC warning. The Society of Obstetricians and Gynaecologists of Canada does not recommend the practice.
A matched study of 138 women with a history of mood disorders found no difference in Edinburgh Postnatal Depression Scale scores between those who consumed their placenta and those who did not. A much larger analysis of 6,038 US community births found placenta consumers scored slightly higher on depression screening — though the authors themselves suspect reverse causation, meaning women already worried about their mood may be likelier to try it in the first place. Either way, there is nothing here supporting it as prevention.
General Social-Support Programs Did Not Reduce Depression
This one is genuinely surprising. PRISM was a community-randomized trial across 16 Australian communities involving more than 11,000 women, combining community and primary-care support programs. Depression scores were essentially identical between the intervention and comparison arms.
That does not mean support does not matter to you personally. It means that funding general community support programs, as a public health strategy, did not measurably lower rates of postpartum depression — and that “build a support network” is not a reliable prevention prescription in the way it is usually offered.
Sleep Interventions Prevent Insomnia, Not Yet Depression
A three-arm randomized trial tested cognitive behavioral therapy for insomnia in pregnancy. It worked — it reduced prenatal insomnia substantially and prevented postpartum insomnia. What it did not establish is whether that prevents postpartum depression; the researchers explicitly say further study is needed on that outcome.
Poor sleep is strongly associated with postpartum depression. Fixing sleep to prevent depression is a reasonable hypothesis that has not yet been tested properly.
Medication to Prevent Recurrence Is a Narrower Question Than It Sounds
If you have had postpartum depression before, it is natural to ask whether starting an antidepressant preventively would stop it happening again.
The honest answer is that nobody knows. A Cochrane review found only two randomized trials on this question, 81 participants between them, both conducted by the same research group, the most recent in 2004. Sertraline showed a directionally positive result that did not reach statistical significance, which the reviewers rated very low quality evidence. Nortriptyline showed no benefit over placebo. No new trial has been completed in over two decades.
That is not a reason to refuse medication, and it is not a reason to start it. It is a reason to have a real conversation with a prescriber about your own history rather than expecting the research to make the decision for you. Both trials enrolled people with at least one prior postpartum episode — not specifically severe cases.
Screening Finds It; What Happens Next Prevents Harm
Screening for depression during pregnancy and after birth is itself recommended — a separate grade B recommendation covering all adults, including pregnant and postpartum people.
But it is worth understanding what screening does. The trials showing that screening improves outcomes largely bundled it with something else: a referral pathway, follow-up, a treatment plan. A questionnaire on its own detects. What happens after a positive score is what changes the outcome.
If you screen positive and nobody follows up, the screen has not helped you. Ask what the next step is.
What Actually Helps, Honestly Stated
- If you have a risk factor, ask about preventive counseling during pregnancy. This is the single evidence-backed action on this page. CBT-based and IPT-based programs both work.
- Ask specifically about ROSE or Mothers and Babies if you are working with a home-visiting program or community health agency, since that is where they are usually delivered.
- Get screened, and ask what happens if the score is high.
- Tell your obstetrician or midwife about a previous episode. Prior postpartum depression is the single clearest risk factor, and it changes what your care team should be watching for.
- Treat sleep, exercise and nutrition as worth doing for their own sake. They are good for you. Do not treat them as insurance against depression, because the evidence does not support that framing.
If It Happens Anyway, That Is Not a Failure
Every intervention on this page with real trial evidence reduces the likelihood of depression in an already at-risk group by well under half. The most effective approach studied still leaves most cases unprevented. Several things that sound obviously helpful — community support programs, supplements, prophylactic medication — either did not work or have never been properly tested.
Postpartum depression is common, it has many contributing causes, and a great deal of it is outside anyone’s control. People develop it having done everything anyone suggested. If that happens to you, it is not evidence that you did not try hard enough.
It is treatable, and the same care that prevents it in some people works to treat it in others. If you are already experiencing symptoms, the signs of postpartum depression and treatment options are the more useful place to start.
If you are having thoughts of harming yourself or your baby, call or text 988. The National Maternal Mental Health Hotline is also available around the clock at 1-833-852-6262.
Frequently Asked Questions
Can postpartum depression be completely prevented?
No. The best-evidenced prevention reduces risk in people who already have risk factors — it does not eliminate the condition. Many cases occur in people with no identifiable risk factor and no way to have seen it coming.
When should preventive counseling start?
The trials generally delivered counseling during pregnancy, sometimes continuing after birth. If you have a risk factor, raise it at a prenatal appointment rather than waiting until after delivery.
Does exercise prevent postpartum depression?
The evidence is mixed and not settled. The Task Force found physical activity interventions showed effects similar to counseling but without reaching statistical significance, and few results have been replicated. One US trial of an app-based activity program in people at high risk found no effect on depressive symptoms at all. Exercise is worth doing. It is not proven prevention.
I had postpartum depression before. What are my options?
Tell your care team early, ask about preventive counseling during this pregnancy, and discuss with a prescriber whether medication makes sense for you. The research on preventive antidepressants is too thin to give a general answer, which is exactly why it should be an individual conversation.
Does breastfeeding prevent or cause postpartum depression?
Neither reliably. Difficulty with breastfeeding, and stopping earlier than intended, are associated with depressive symptoms — but feeding method itself is not a prevention strategy, and formula feeding does not cause depression.
