A fetus or foetus is the unborn offspring that develops from an animal embryo. Following embryonic development the fetal stage of development takes place. In human prenatal development, fetal development begins from the ninth week after fertilization and continues until birth. Prenatal development is a continuum, with no clear defining feature distinguishing an embryo from a fetus. However, a fetus is characterized by the presence of all the major body organs, though they will not yet be fully developed and functional and some not yet situated in their final anatomical location.

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For the First Time: Doctors Have Successfully Treated a Fetus With a Devastating Genetic Disorder

Working in extreme heat puts strain on fetus

Pre-eclampsia may raise a fetus's risk of heart disease in later life

Enzyme treatment given directly to fetus prevents symptoms of rare genetic disease

Toxic Air Pollution Particles Can Get Into Fetus Brains, Lungs, Livers, Says New Study

'Placenta-on-a-chip' mimics malaria-infected nutrient exchange between mother-fetus

CDC: Listeria Outbreak Linked To Florida, 22 Hospitalized, One Dead, One Lost Fetus

Nanoparticles can cross the placenta during pregnancy, potentially exposing fetus

Placenta plays active part in transferring vitamin D to fetus during pregnancy

Fetus inside Egyptian mummy was 'pickled like an egg,' researchers say