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Objective: To determine the change in English emergency postnatal maternal readmissions 2007–2017 (pre‐COVID‐19) and the association with maternal demographics, obstetric risk factors and postnatal length of stay (LOS). Design: National cohort study. Setting: All English National Health Service hospitals. Population: A total of 6 192 140 women who gave birth in English NHS hospitals from April 2007 to March 2017. Methods: Statistical analysis using birth and readmission data from routinely collected National Hospital Episode Statistics (HES) database. Main Outcome Measures: Rate of emergency postnatal maternal hospital readmissions related to pregnancy or giving birth within 42 days postpartum, readmission diagnoses and association with maternal demographic factors, obstetric risk factors and postnatal LOS. Results: A significant increase in the rate of emergency postnatal maternal readmissions from 15 128 (2.5%) in 2008 to 20 734 (3.4%) in 2016 (aOR 1.32, 95% CI 1.28–1.37) was found. Risk factors for readmission included minoritised ethnicity (particularly Black or Black British ethnicity: aOR 1.35, 95% CI 1.31–1.39); age < 20 years (aOR 1.09, 95% CI 1.05–1.12); 40+ years (aOR 1.07, 95% CI 1.03–1.10); primiparity (multiparity: aOR 0.92, 95% CI 0.91–0.93); nonspontaneous vaginal birth modes (emergency caesarean: aOR 1.86, 95% CI 1.82–1.90); longer LOS (4+ vs. 0 days: aOR 1.58, 95% CI 1.53–1.64); and obstetric risk factors including urinary retention (aOR 2.34, 95% CI 2.06–2.53) and postnatal wound breakdown (aOR 2.01, 95% CI 1.83–2.21). Conclusions: The concerning rise in emergency maternal readmissions should be addressed from a health inequalities perspective focusing on women from minoritised ethnic groups; those < 20 and ≥ 40 years old; primiparous women; and those with specified obstetric risk factors. [ABSTRACT FROM AUTHOR]