Research has also demonstrated the effectiveness and safety of COVID-19 vaccination among breastfeeding mothers, with only minimal disruption of lactation or adverse effects on the breastfed child [63], providing anti-SARS-CoV-2-specific IgA and IgM antibodies that pass into the breastmilk and protect the breastfed baby [64,65]. The gene discussed is CD40LG; the disease is COVID-19.