The Collaborative International Dictionary of English v.0.48:

Bambino \Bam*bi"no\ (b[aum]m*b[=e]"n[-o]), n.; It. pl. -ni.
   [It., a little boy, fr. bambo silly; cf. Gr. bambali`zein,
   bambai`nein, to chatter.]
   1. A child or baby; esp., a representation in art of the
      infant Christ wrapped in swaddling clothes.
      [Webster 1913 Suppl.]

   2. (Sports) George Herman Ruth ("Babe" Ruth), the baseball
      player; -- usu. in the form "the bambino".
      [1913 Webster]

WordNet (r) 3.0 (2006):

bambino
    n 1: a young child [syn: toddler, yearling, tot,
         bambino]