
In a 24.5-year cohort of 33,785 nulliparous births, teenagers (14–15 years) had a 91% vaginal delivery rate, compared to just 55% at ≥40 years. C-section rates rose with age, from 9% to 45%. Operative vaginal deliveries also increased with age. “Abnormal fetal monitoring” showed a negative linear trend, while obstructed labor increased non-linearly. Teenagers’ higher unassisted vaginal birth rates may stem from stronger uterine contractility.
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