Introduction Human milk cannot currently be considered a major source of COVID-19 infection. On the other hand, it can contain specific antibodies that could modulate a possible newborn infection by SARS-CoV-2. Main issue A 32-year-old pregnant woman, gestational age 37 and 3/7 weeks, was admitted with a flu-like syndrome caused by COVID-19. The female newborn was appropriate for gestational age, with a birth weight of 2,890 g, length 48 cm, and head circumference 34 cm. Management The mother–infant dyad remained in the rooming-in unit during hospitalization, exclusively breastfeeding and following World Health Organization recommendations for contact and airway precautions. On the 3rd day after delivery, two mother’s milk samples (3 and 5 mL) were collected by hand expression. The samples were centrifuged for 10 min twice consecutively to separate fat, which was removed, and the remaining material was transferred to another tube to determine anti-SARS-CoV-2 Immunoglobulin A and Immunoglobulin G (ELISA, Kit EUROIMMUN AG, Luebeck, Germany). Anti-SARS-CoV-2 Immunoglobulin A was detected in the two samples evaluated, whose values were 2.5 and 1.9, respectively. No anti-SARSCoV-2 immunoglobulin G was detected. The exclusively-breastfed infant remained well through 45 days of age. Conclusion The presence of SARS-CoV-2 Immunoglobulin A in the milk of mothers infected with COVID-19 may be related to protection against the transmission and severity of the disease in their infants.

Objectives To describe the presence of anti-SARS-CoV-2 IgA and IgG in the blood and colostrum of women with COVID-19 infection during pregnancy and associate the presence of anti-SARS-CoV-2 IgA in colostrum with clinical symptoms of their newborns. Methods A cross-sectional study was developed with 165 participants with COVID-19 infection during pregnancy and their newborns. Data collected: characteristics COVID-19 infection in pregnant women, gestational age, and clinical symptoms in their newborns (fever, hypothermia, respiratory distress, hypotonia, hypoactivity, hypoglycemia, cyanosis, vomiting/regurgitation, abdominal distention, and jaundice). Maternal blood and colostrum samples were collected postpartum to to detect the presence of IgA and IgG anti-SARS-CoV-2. Results The median interval between COVID-19 diagnosis and delivery was 37.5 days ( IQ = 12.0, 73.0 days). Clinical symptoms during hospitalization were observed in 55 newborns (33.3%), and two (1.6%) tested RT-PCR positive for COVID-19. Positive colostrum for anti-SARS-CoV-2 IgA was found in 117 (70.9%) women. The presence of anti-SARS-CoV-2 IgA in colostrum was associated independently with lower clinical symptoms in their newborns ( OR = 0.42; 95% CI 0.202 to 0.84; p = 0.015). Conclusions for Practice The presence of anti-SARS-CoV-2 IgA in colostrum was detected in more than two-thirds of the women evaluated and was associated with a lower frequency of clinical symptoms in their newborns. Supplementary Information The online version contains supplementary material available at 10.1007/s10995-022-03553-9.

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