Weight-related characteristics reported to be associated with progression to T2DM include high pre-pregnancy BMI, weight gain after GDM, and most recent BMI after GDM pregnancy.8–10 Other important factors are high fasting glucose during pregnancy, early GDM diagnosis, and ethnicity.11–13 Besides these risk factors, maternal age, a family history of diabetes, parity, HbA1c, and insulin treatment during pregnancy were listed in a recent meta-analysis as maternal characteristics, and factors specific to pregnancy, associated with future onset of T2DM.14 Here, INS is linked to gestational diabetes.