Essential for Biology and Human Sexuality Lessons. Various stages of fetal development are featured in one beautifully detailed set of eight life-size models, each a re-creation of the uterus with a fetus. Five of the models shows a fetus at different times during the gestation period: models 1-3 each correspond to the first three months of pregnancy, model 4 depicts the fetus in the fourth to the fifth month, and model 8 presents a seven month- old fetus. Model 5 shows the fetus in a breech position, model 6 shows the fetus on its back, and model 7 depicts twin five-month-old fetuses in the uterus. In addition, models 4-8 features for a closer examination of the anatomical features that have developed. The one, two, and three piece models are mounted on individual standswith numbered Key Card.