postnatus
noun
post·na·tus
(ˈ)pōs(t)ˈnātəs
plural postnati
-āˌtī
: a person born after an event especially with reference to the existence of political rights (as a person born in one of the 13 American colonies after the Declaration of Independence) —usually used in plural
of the slaves only the postnati were freed
—opposed to antenatus 
Word History
Etymology
Medieval Latin