noun
wet-nursing; having one's baby nursed by another woman; breast milk from another woman
Refers to the practice of having a baby breastfed by a woman who is not the mother, or the milk itself. The term is somewhat dated and may appear in historical or childcare contexts.
昔は、母親が病気のときにもらい乳を頼むことがあった。
In the past, people sometimes asked for wet-nursing when the mother was ill.
この資料には、もらい乳の習慣について詳しく書
This document describes the custom of wet-nursing in detail.
Kanji spelling using 貰う, but もらい is usually written in kana in modern Japanese.
母乳 refers to breast milk in general, especially the mother's own milk, while もらい乳 specifically means milk received from another woman or the practice of wet-nursing.
粉ミルク is formula milk, a modern alternative to breast milk, whereas もらい乳 is a traditional practice involving another woman's milk.
Compound of もらい (receiving) and 乳 (milk). The reading ぢち is a rendaku form of ちち (milk).