AVP and gestational diabetes: The maternal plasma (non-GDM: 7–8 ng/mL and for GDM: 8–12 ng/mL) and milk copeptin concentrations did not vary significantly with the lactation progression, namely in colostral (non-GDM: ~9 ng/mL; GDM: ~14 ng/mL), transitional (non-GDM: ~8 ng/mL; GDM: ~11 ng/mL), and mature milk periods (non-GDM: ~9 ng/mL; GDM: ~10 ng/mL).