fetus By Ivan Suarez Robles 16 Nov, 2010 In human beings, the unborn young from the eighth week of pregnancy to birth; an organism in the stage of development that follows the embryonic stage.Related Articles: A Case Study: Pregnancy and HD in IndiaEternal on the Water by Joseph MonningerGlossary: fetal neuronsGlossary: teratogenicGlossary: amniocentesis