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Aim  The objective of this study was to evaluate associations between maternal concentrations of 25‐hydroxyvitamin D (25(OHD)) and birth outcomes: mode of delivery and episiotomy rate.    Design and Methods  One hundred and seventeen pregnant women were enrolled in an observational, longitudinal, prospective cohort study. Multivariable linear regression analyses were performed to assess relationships between maternal 25(OHD) concentrations and mode of delivery. To account for systematic temporal variation in 25(OHD), a cosinor model to the data was fitted.    Results  No significant statistical associations were found between adjusted maternal 25(OHD) concentrations and risk of eutocic vaginal delivery, instrumented delivery (OR 1.05 [95% CI: 0.97–1.13]), primary Caesarean section (OR 0.99 [95% CI: 0.88–1.11]) or Caesarean section for any other causes (OR 1.04 [95% CI: 0.95–1.14]). High 25(OHD) levels tended to show a protective effect on performance of episiotomy, without reaching statistical significance (OR 0.36 [95% CI: 0.09, 1.37]).

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Associations between maternal circulating 25‐hydroxyvitamin D concentration and birth outcomes—Mode of delivery and episiotomy rate: A prospective cohort study