weaner

transitive verb

1. to cause (a child or young animal) to become accustomed gradually to food other than its mother's milk; to cause to give up suckling; now, often, to cause to give up drinking milk from a bottle with a nipple
2. to withdraw (a person) by degrees (from a habit, object of affection, occupation, etc.), as by substituting some other interest
3. to be raised on or brought up with; to become accustomed to: with on: weaned on good books