This review aims to examine how childbirth position during labour affects maternal, fetal and neonatal outcomes. Epidemiological data suggest that vertical birthing positions have many benefits. But when we consider the players and mechanisms of delivery, including the forces generated to move the fetus and obstacles to its progression, many questions remain about the advantage of one position over another. Thus, childbirth could be considered in a way as an athletic feat that probably requires the choice of optimal positions. These should be individually suited to each woman at different stage of labour to improve its efficiency and effectiveness. Tweetable abstract: Beyond epidemiological data, biomechanical investigations is necessary to assess birth's position.