infant

Etymology

From Middle English infaunt, borrowed from Latin īnfantem, accusative masculine singular of īnfāns, nominal use of the adjective meaning 'not able to speak', from īn- (“not”) + fāns, present participle of for (“to speak”). The verb is from Anglo-Norman enfanter, from the same Latin source. Doublet of infante.

noun

1. A very young human being, from conception to somewhere between six months and two years of age after birth, needing almost constant care and attention.
2. (law) A minor.
   Thomas Humphrey Doleman died the 30th of August 1712, an infant, intestate and without issue; Lewis the next nephew died the 17th of April 1716, an infant about sixteen years old, having left his mother Mary Webb, ... 1793, William Peere Williams, Samuel Compton Cox, Reports of Cases Argued and Determined in the High Court of Chancery, and of Some Special Cases Adjudged in the Court of King's Bench [1695-1735]: De Term. S. Trin. 1731, page 602
3. (obsolete) A noble or aristocratic youth.

verb

1. (obsolete) To bear or bring forth (a child); to produce, in general.