Only one single-center cohort study on 950 participants has focused on the associations between pre-conceptional FAS duration (longer or less than three months) and multiple pregnancy outcomes, including GDM, cesarean delivery, preterm birth, early-term birth, macrosomia, low birth weight, small for gestational age (SGA), and large for gestational age (LGA) [4]. This evidence concerns the gene FAS and gestational diabetes.