This study aimed to quantify key antioxidant markers—superoxide dismutase isoforms (SOD1, SOD3), glutathione (GSH), and the oxidative DNA damage marker 8-hydroxy-2-deoxyguanosine (8-OHdG)—in AF across gestational ages and compare them with those in human milk (HM). The gene discussed is SOD1; the disease is atrial fibrillation.