Table 1 Inclusion and exclusion criteria

Inclusion criteria for OptiBreech 1 included the following:

•Singleton pregnancy ≥ 37⁺⁰ weeks with a breech-presenting foetus confirmed by ultrasound scan (for counselling)

•Eligible for approach and recruitment from 36⁺⁰

•Referred by obstetric consultant, midwife or self (from a different hospital)

•Requesting a vaginal breech birth under current Trust guideline

•Giving informed consent to participate in outcome monitoring as part of the study

Exclusion criteria included the following:

•Absolute contraindication to vaginal birth, such as placenta praevia

•Multiple gestation (twins, triplets, etc.)

•The proficient team declines to offer care because the clinical case is outside the team’s local guideline or experience level (at the discretion of the breech leads)