Induced lactation is indeed possible through dedicated nipple stimulation — either by putting baby to breast or with the aid of a breast pump — and is sometimes used by moms (and, very rarely, men) with adopted or surrogate children who want to breastfeed. Mary Ellen has opted for something called the Newman-Goldfarb protocol, a physician-developed approach that combines pumping with the taking of a drug called domperidone.
The drug part sounds a little disturbing.