wean

v. 1 accustom (an infant or other young mammal) to food other than (esp. Its mother's) milk. 2 (often foll. By from, away from) disengage (from a habit etc.) By enforced discontinuance. [old english, = accustom]

a. To accustom and reconcile, as a child or other young animal, to a want or deprivation of mother's milk; to take from the breast or udder; to cause to cease to depend on the mother nourishment.