In contrast to donor human milk purchased milk is “breast milk that is obtained from a mother other than the infant’s own in exchange for money or services and that has not been screened or processed by a milk bank” (Rasmussen et al. 2017). This practice is discouraged because the milk may not be pure nor safe (Weaver et al. 2019). This practice bears the risk that the mother's infant is deprived of breast milk and fed a product instead. Breast milk is the preferred feeding for all infants (World Health Organization. 2009).