noun, plural: fetuses
Following the embryonic stage, the developing young enters the fetal period, which is in the later stages of development prior to birth. The fetal period is when the offspring has taken a recognizable form as its own species. The fetus is also characterized to possess the major organs in contrast to an embryo. Tthe fetal organs though are not yet fully functional and are still undergoing further development.
Word origin: Latin fetus (offspring, brood)