noun
witch's milk; neonatal milk secretion
Medical term for milk-like secretion from the breasts of some newborn infants, caused by maternal hormones. Rare in everyday conversation; used mainly in pediatric or medical contexts.
新生児に鬼乳が見られることがありますが、通常は心配ありません。
Witch's milk may be seen in newborns, but it is usually nothing to worry about.
The term 鬼乳 (literally 'demon milk') is a direct translation of the English 'witch's milk', likely coined in medical literature. The alternate form 奇乳 uses 奇 ('strange') to emphasize the unusual nature of the secretion.