母乳
Breast milk is considered to be healthier than cow's milk and infant formula when it comes to feeding an infant in the first 6 months of life, but only under extreme situations do international health organizations support feeding an infant breast milk from a healthy wet nurse rather than that of its biological mother. One reason is because the unregulated breast milk market is fraught with risks, such as drugs of abuse and prescription medications being present in donated breast milk. The transmission of these substances through breast milk can do more harm than good when it comes to the health outcomes of the infant recipient.