puerperal adj.

suffix forming adjectives from nouns or other adjectives, "of, like, related to, pertaining to," Middle English -al, -el, from French or directly from Latin -alis (see -al (2)).

late 15c., puerilite, "a childish or silly act or expression," from Old French puérilité (15c.), from Latin puerilitatem (nominative puerilitas) "childishness," from puerilis "boyish, youthful; childish, trivial, silly," from puer "child, boy" (from PIE root *pau- (1) "few, little," with sense extended to "small, young;" source also of Latin putus "boy," Sanskrit putrah "son, boy," Avestan puthra- "son, child"). Meaning "puerile character or condition, boyishness" is by 1570s.