The author, basing his conclusions on an experience of 491 deliveries and a review of the most recent literature, comes to the conclusion that the problem of breech delivery can be considered thus: It is not properly described as a dystocic delivery, but it is a high risk delivery with an outcome that is always uncertain. The proof of this is that the perinatal mortality swings between 0.5 to 2 or 3% according to different authors. The lesions that cause this mortality and their mechanism are well known. It consists of potential dangers, the realisation of which depends on the conditions and the way in which the deliveries are conducted. As far as treatment is concerned, there is no well established line of conduct but only opinions based on individual experiences. It is only by carrying out a large prospective study that the best way in which breech deliveries should be performed can be worked out.