Source : Webster's Revised Unabridged Dictionary (1913)

Infancy \In"fan*cy\, n. [L. infantia: cf. F. enfance. See
   {Infant}.]
   1. The state or period of being an infant; the first part of
      life; early childhood.

            The babe yet lies in smiling infancy. --Milton.

            Their love in early infancy began.    --Dryden.

   2. The first age of anything; the beginning or early period
      of existence; as, the infancy of an art.

            The infancy and the grandeur of Rome. --Arbuthnot.

   3. (Law) The state or condition of one under age, or under
      the age of twenty-one years; nonage; minority.

Source : WordNet®

infancy
     n 1: the early stage of growth or development [syn: {babyhood}, {early
          childhood}]
     2: the earliest state of immaturity [syn: {babyhood}]