Supporting a partner through the fourth trimester
Partner support matters: in a meta-analysis of 84 studies, low social support and marital difficulties were two of thirteen significant predictors of postpartum depression, each with a moderate effect (Beck, Nurs Res 2001, PMID 11570712). What you say, what you notice, and what you take off her plate can change the shape of the first year.
Watch, don't quiz
Instead of asking "how are you?" — which almost always gets "fine" — notice specifics. Is she eating? Sleeping when she can? Making eye contact with the baby? Answering the phone? Small changes over a week matter more than any single moment.
Take ownership, not tasks
"Let me know what you need" adds to her mental load. Owning a category outright — bottles, laundry, the pediatrician's appointments — removes it. The goal is fewer decisions, not more offers.
Protect one sleep stretch
Handle one overnight feed or the first two hours of the morning so she gets a protected 4- to 5-hour stretch. Protecting one consolidated block of sleep is one of the most practical things a partner can do; a 2024 clinical review found that for mothers at high risk of postpartum depression, or with moderate to severe symptoms, it may be necessary and effective as part of prevention and treatment (Leistikow et al., Semin Perinatol 2024, PMID 39048415).
Say the hard thing
If you're worried, say so plainly and without judgment: "I've noticed you haven't been yourself. I'd like us to call your OB together." Most parents in a PMAD say later that they wish someone had named it sooner.
More on partner mental health at Dads Corner and For Fathers.