Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
breast-feed [ˈbrɛstfiːd] irreg like feed vt корми́ть*(покорми́ть*perf) гру́дью
vi корми́ть (impf) (гру́дью)
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: