“…In general, people with an impaired immune function, like the elderly, experience the most severe symptoms of COVID-19. Newborn infants also have an impaired immune function due to the lack of a fully developed immune system; therefore, they may be seriously affected by SARS-CoV-2, although usually mildly (Adeyinka et al, 2021;Barrero-Castillero et al, 2020;De Rose et al, 2020;Kim et al, 2020;Raschetti et al, 2020;Shah & Saugstad, 2020). Human milk is considered to be the main source of passive and active immunity for newborns and infants, as it contains a large array of bioactive factors, including antibodies, oligosaccharides, nucleic acids, and cytokines, that help enrich an infant's immune system (Mosca & Giannì, 2017).…”