Background OptiBreech collaborative care is a multi-disciplinary care pathway for breech presentation at term. The OptiBreech Multiple Trial Cohort is designed to host multiple trials related to care for breech presentation. This design enables prospective data collection for a large cohort of women planning a vaginal breech birth (VBB). to assess rare safety outcomes. https://parisnaturalfoodes.shop/product-category/magnesium-oxide-250mg/