Source : Webster's Revised Unabridged Dictionary (1913)

Nestling \Nes"tling\ n.
   1. A young bird which has not abandoned the nest. --Piers
      Plowman.

   2. A nest; a receptacle. [Obs.] --Bacon.

Nestling \Nes"tling\, a.
   Newly hatched; being yet in the nest.

Nestle \Nes"tle\, v. i. [imp. & p. p. {Nestled}; p. pr. & vb. n.
   {Nestling}.] [AS. nestlian.]
   1. To make and occupy a nest; to nest. [Obs.]

            The kingfisher . . . nestles in hollow banks.
                                                  --L'Estrange.

   2. To lie close and snug, as a bird in her nest; to cuddle
      up; to settle, as in a nest; to harbor; to take shelter.

            Their purpose was to fortify in some strong place of
            the wild country, and there nestle till succors
            came.                                 --Bacon.

   3. To move about in one's place, like a bird when shaping the
      interior of her nest or a young bird getting close to the
      parent; as, a child nestles.

Source : WordNet®

nestling
     n 1: young bird not yet fledged [syn: {baby bird}]
     2: a young person of either sex; "she writes books for
        children"; "they're just kids"; "`tiddler' is a British
        term for youngsters" [syn: {child}, {kid}, {youngster}, {minor},
         {shaver}, {nipper}, {small fry}, {tiddler}, {tike}, {tyke},
         {fry}]