Middle English from Old French enfantfrom Latin īnfānsīnfant-fromīnfānsnot able to speak, youngin-notin–1fānspresent participle offārīto speakbhā-2 in Indo-European roots
American Heritage Dictionary of the English Language, 5th Edition
Latinīnfantem, 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-Normanenfanter, from the same Latin source.
Infant Sentence Examples
Martha was alone with an infant and it was after nine o'clock.
And an infant baby cried.
Infant Baptism is practised.
With a grant from the National Foundation for Infant Paralysis, he went to work on a polio vaccine.
"It's unfair to Martha to leave her alone with an infant," I answered.