No cases of an infant contracting COVID-19 from breast milk have been documented, but questions about the potential risk remain. Researchers examined 64 samples of breast milk collected from 18 women across the United States who were infected with the new coronavirus (SARS-CoV-2) that causes COVID-19. One sample tested positive for coronavirus RNA, but follow-up tests showed that the virus couldn't replicate and therefore, couldn't infect the breastfed infant, according to the study recently published online in JAMA.