The Collaborative International Dictionary of English v.0.48:

Suckling \Suck"ling\, n. [OE. sokeling. See Suck, v. t.]
   1. A young child or animal nursed at the breast.
      [1913 Webster]

   2. A small kind of yellow clover (Trifolium filiforme)
      common in Southern Europe.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Suckle \Suc"kle\, v. t. [imp. & p. p. Suckled; p. pr. & vb. n.
   Suckling.] [Freq. of suck.]
   To give suck to; to nurse at the breast. --Addison.
   [1913 Webster]

         The breasts of Hecuba
         When she did suckle Hector, looked not lovelier.
                                                  --Shak.
   [1913 Webster]

         They are not weak, suckled by Wisdom.    --Landor.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Suckling
    n 1: English poet and courtier (1609-1642) [syn: Suckling,
         Sir John Suckling]
    2: an infant considered in relation to its nurse [syn:
       nursling, nurseling, suckling]
    3: a young mammal that has not been weaned
    4: feeding an infant by giving suck at the breast [syn:
       suckling, lactation]

Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "suckling":
   babe, baby, baby bunting, bambino, incubator baby, infant,
   little angel, little darling, mewling infant, neonate, nursling,
   papoose, preemie, premature baby, preschooler, puling infant,
   toddler, weanling, yearling