<unk>  is the process in which an embryo or fetus (or foetus) gestates during pregnancy, from fertilization until birth.  Often, the terms fetal development, foetal development, or embryology are used in a similar sense.
After fertilization the embryogenesis starts. In humans, when embryogenesis finishes, by the end of the 10th week of gestational age, the precursors of all the major organs of the body have been created. Therefore, the following period, the fetal period, is described both topically on one hand, i.e. by organ, and strictly chronologically on the other, by a list of major occurrences by weeks of gestational age.
Prenatal development
Kidney development
Gestation period
Human embryogenesis
Perinatal period
Child psychopathology
Eye development
Sexual maturity