Set of eight models (14 pieces) illustrates the detailed stages of pregnancy development. Includes a first-month embryo, second-month embryo, third-month embryo, fourth-month fetus in transverse lie position, fifth-month fetus in breech position, fifth-month fetus in transverse lie position, fifth-month twin fetuses, and seventh-month fetus. Each model is on a base and measures approx. 4-1/2 in. x 6 in. x 8 in..