This terracotta model, commissioned by Giuseppe Galletti, describes a birth with incomplete, "buttocks-first" breech presentation. The fetus, in posterior position, presents its buttocks, with both lower limbs extended slightly upward. We can see that the membranes are ruptured and the uterus compresses the presentation, squeezing the thigh and tibia against the abdomen to reduce the sacro-tibial diameter. The longitudinal uterine fibers drive the presented part forward; it will then be compressed by the pelvic girdle.