Michel Odent is a French surgeon and obstetrician who was in charge of the Pithiviers Maternity Unit for over 20 years. At a time when cesarean rates were rising and births in France were highly medicalized, Odent turned the maternity wing at his state hospital into a haven for undisturbed, physiological birth. Most of his changes were low-cost and low-tech: creating an environment in which women were private and completely undisturbed during labor. He replaced delivery tables with big, low mattresses and cushions, birth pools, and simple furniture to aid spontaneous movement. His maternity unit had a 6-7% cesarean rate during the 1970s and 80s, even though it accepted an unscreened population.
I just opened Birth Reborn after a good year or two and turned to a section on breech birth. In his words and photos (pages 103-105 in the 2nd edition):
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If, on the other hand, contractions in the first-stage labor are painful and inefficient and dilation does not progress, we must quickly dispense with the idea of vaginal delivery. Otherwise we face the danger of a last-minute "point of no return" when, after the emergence of the baby's buttocks, it is too late to switch strategies and decide on a cesarean. However, although we always perform cesareans when first-stage labor is difficult and the situation is not improving, most breech births in our clinic do end up as vaginal deliveries.
Here is a brief video of a breech birth at Pithiviers. Notice that the baby does not rotate to sacrum-anterior after the trunk is born (the most likely culprit is a nuchal arm). Odent steps in right away and frees the arm. The baby is born very quickly.