Composition of the human milk microbiome in the GUSTO cohort is shaped by intrapartum antibiotic prophylaxis and breastfeeding exclusivity. - Stinson LF; Pang WW; Rea A; Fok D; Chua MC; Tan KH; Yap F; Godfrey KM; Shek LP; Eriksson JG; Chong Y-S; Chan S-Y; et al. (MSystems, 2025)