Postnatal mental health

It is day 3 on the postnatal ward and the woman in bed 9 has not slept for two nights. The midwife says she is "a bit emotional". You almost walk past — and then you notice she is pressing her baby to her chest and whispering that the nurses are trying to poison the milk. That sentence is the difference between reassurance and a psychiatric emergency. Postnatal mental illness is where obstetrics and psychiatry collide, and the registrar who can separate the three conditions in the first minute is the one who prevents the catastrophe.^[6][8]

Overview and definition

Postnatal mental illness is not one disease, and your first job is to name which one you are looking at. ^[1][6]

• Baby blues — the common, self-limiting mood dip of the first week. Tearful, overwhelmed, settles without treatment.^[1]
• Postnatal depression — a depressive episode meeting criteria in the postnatal year. Commoner than people think, under-recognised, and treatable.^[3]
• Puerperal (postpartum) psychosis — the abrupt onset of mania, depression with psychosis, or mixed affective psychosis in the first two to four weeks. A psychiatric emergency with a real risk of suicide and infanticide.^[6][8]

The "perinatal" period, for mental-health purposes, runs from conception to 12 months after birth — wider than the obstetric puerperium. A woman who becomes unwell at seven months postpartum is still a perinatal patient, and the screening, referral and mother-infant considerations all still apply.^[3]

References15ShowHide

1. [1]Cox JL, Holden JM, Sagovsky R Detection of postnatal depression. Development of the 10-item Edinburgh Postnatal Depression Scale. Br J Psychiatry, 1987.PMID 3651732
2. [2]Qiu X, Wu Y, Sun Y, Levis B, et al. Individual participant data meta-analysis to compare EPDS accuracy to detect major depression with and without the self-harm item. Sci Rep, 2023.PMID 36899016
3. [3]Ferrari AJ, Miller PA, Shadid J, Herrera AM, et al. The global prevalence of major depressive disorder during the peripartum period: a systematic review and meta-regression. Lancet Psychiatry, 2026.PMID 42070579
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10. [10]Meltzer-Brody S, Colquhoun H, Riesenberg R, Epperson CN, et al. Brexanolone injection in post-partum depression: two multicentre, double-blind, randomised, placebo-controlled, phase 3 trials. Lancet, 2018.PMID 30177236
11. [11]Wilson CA, Robertson L, Ayre K, Hendon JL, et al. Brexanolone, zuranolone and related neurosteroid GABA(A) receptor positive allosteric modulators for postnatal depression. Cochrane Database Syst Rev, 2025.PMID 40562419
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