This study has dual objectives: (1) in relation to the trimester of infection to examine the frequency, concentration and duration of IgA and IgG antibodies in breastmilk and blood serum in the third and sixth month post-partum in former SARS-CoV-2-infected mothers and (2) to examine the association in the pediatric emergency admission of children within the first six months of life compared to children of non-SARS-CoV-2-infected women. The gene discussed is CD79A; the disease is infection.