Pertaining to a time or mindset in which the identity of a nation is no longer important.

Immediately following birth

(archaic) subsequent

(of a baby) after being born, of or pertaining to the period immediately after birth / (proscribed) (of a mother) after giving birth

(psychology) Postpartum depression.

plural of postnatal depression

(politics) The theory or conception of the world after the existence of nation-states.