/ Thesaurus / P Synonyms of postmature infant Find synonyms for: Noun1. postmature infant, neonate, newborn, newborn infant, newborn babyusage: infant born after 42 weeks of gestation; usually shows signs of placental insufficiencyWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language