The 3B Scientific L11 pregnancy series model is used for anatomical study of human development from the fourth week through the seventh month. The L11 consists of nine natural-size models for effective demonstration: 25X life-size, four week human embryo; first month embryo; second month embryo; third month embryo; fourth month fetus (transverse lie); fifth month fetus (breech position); fifth month fetus (transverse lie); fifth month twin fetuses (normal position); and seventh month fetus. The fetus is removable in the fourth to seventh-month models. (Not all models pictured.)