Background: The Fibroblast Growth Factor (FGF) 19 subfamily plays a key role in the regulation of metabolic and growth processes, and their dysregulation can lead to fetal growth disorders, such as small for gestational age (SGA) and large for gestational age (LGA), as well as to pathogenesis and development of gestational diabetes and gestational hypertension. This evidence concerns the gene FGF19 and gestational diabetes.