in·fant 
(
ĭn
f
ənt)
n.1. A child in the earliest period of life, especially before he or she can walk.
2. Law A person under the legal age of majority; a minor.
3. A very young nonhuman mammal, especially a primate.
adj.1. Of or being in infancy.
2. Intended for infants or young children.
3. Newly begun or formed: an infant enterprise.
[Middle English, from Old French enfant, from Latin īnfāns, īnfant-, from īnfāns, not able to speak, young : in-, not; see IN-1 + fāns, present participle of fārī, to speak; see bhā-2 in the Appendix of Indo-European roots.]