The Collaborative International Dictionary of English v.0.48:

Infant \In"fant\, n. [L. infans; pref. in- not + fari to speak:
   cf. F. enfant, whence OE. enfaunt. See Fame, and cf.
   Infante, Infanta.]
   1. A child in the first period of life, beginning at his
      birth; a young babe; sometimes, a child several years of
      age.
      [1913 Webster]

            And tender cries of infants pierce the ear. --C.
                                                  Pitt.
      [1913 Webster]

   2. (Law) A person who is not of full age, or who has not
      attained the age of legal capacity; a person under the age
      of twenty-one years; a minor.
      [1913 Webster]

   Note: An infant under seven years of age is not penally
         responsible; between seven and fourteen years of age,
         he may be convicted of a malicious offense if malice be
         proved. He becomes of age on the day preceding his
         twenty-first birthday, previous to which time an infant
         has no capacity to contract.
         [1913 Webster]

   3. Same as Infante. [Obs.] --Spenser.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Infant \In"fant\, a.
   1. Of or pertaining to infancy, or the first period of life;
      tender; not mature; as, infant strength.
      [1913 Webster]

   2. Intended for young children; as, an infant school.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Infant \In"fant\, v. t. [Cf. F. enfanter.]
   To bear or bring forth, as a child; hence, to produce, in
   general. [Obs.]
   [1913 Webster]

         This worthy motto, "No bishop, no king," is . . .
         infanted out of the same fears.          --Milton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

infant
    n 1: a very young child (birth to 1 year) who has not yet begun
         to walk or talk; "the baby began to cry again"; "she held
         the baby in her arms"; "it sounds simple, but when you have
         your own baby it is all so different" [syn: baby, babe,
         infant]