Human Embryogenesis, Fertilization And Fetus Development

A fetus (/ˈfiːtəs/; also spelled foetus, fœtus, faetus, or fætus) is a developing mammal or other viviparous vertebrate after the embryonic stage and before birth.
In humans, the fetal stage of prenatal development starts at the beginning of the 11th week in gestational age, which is the 9th week after fertilization.