Association between preterm birth subtypes and severe maternal morbidity: a retrospective cohort study

Preterm delivery, particularly when medically indicated, is strongly associated with increased risk of SMM during delivery hospitalization, throughout the postpartum period, and with postpartum readmissions. These findings suggest that individuals experiencing preterm birth, especially medically indicated preterm deliveries, may benefit from targeted postpartum monitoring and follow-up, including earlier clinical contacts and closer surveillance for complications beyond the standard 6-week postpartum visit.