Some more info:
Most donors have already had routine prenatal testing done for diseases like HIV and Hep C, and additional testing can be done if requested, this is left up to the donor and the recipient's family. Using formula to supplement may seem safe, but it can be contaminated with bacteria, which can cause a deadly form of meningitis in preemies and other illnesses, or even contain ground up bug parts. The CDC has this to say on milk-sharing, "For women who do not have HIV or other serious infectious diseases, there is little risk to the child who receives her breast milk." The World Health Organization supports milk-sharing stating that "breast milk from a healthy wet-nurse or a human-milk bank" is a preferred alternative when the mother cannot breastfed her own infant. The WHO also states that, "Infants who are not
breastfed, for whatever reason, should receive special attention from
the health and social welfare system since they constitute a risk
group." Read more about the risks of not receiving breast milk HERE.