nascent [ˈnæsənt] a.
1.) Commencing, or in process of development; beginning to exist or to grow; coming into being; as, a nascent germ.
2.) (Chem.) Evolving; being evolved or produced; as, nascent oxygen (GNU Collaborative International Dictionary of English).
Etymology: Latin nascens, present participle of nasci, to be born.
"Assuredly the being able to reach, at each stage of increased size, to a supply of food, left untouched by the other hoofed quadrupeds of the country, would have been of some advantage to the nascent giraffe" (On the Origin of Species by Means of Natural Selection, Charles Darwin, 1859).