INFANT is a 6 letter word that starts with I.

1. \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.
   
            And tender cries of infants pierce the ear. --C.
                                                  Pitt.
   
   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.
   
   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.
   
   3. Same as {Infante}. [Obs.] --Spenser.
   
   

2. \In"fant\, a.
   1. Of or pertaining to infancy, or the first period of life;
      tender; not mature; as, infant strength.
   
   2. Intended for young children; as, an infant school.
   
   

3. \In"fant\, v. t. [Cf. F. enfanter.]
   To bear or bring forth, as a child; hence, to produce, in
   general. [Obs.]
   
         This worthy motto, ``No bishop, no king,'' is . . .
         infanted out of the same fears.          --Milton.