Savirón-Cornudella R, Esteban LM, Aznar-Gimeno R, et al. - This research was intended to construct fetal growth standards for twin gestations by placental chorionicity in a Spanish population and compare them with European and American standards to estimate the suitability of their use in clinical practice. Researchers conducted a retrospective cohort study including a total of 518 twin pregnancies, 435 dichorionic-diamniotic, and 83 monochorionic-diamniotic, conducted between January 2012 and December 2017. The clear differences were found among small and large for gestational age cases provided by twin standards in the studied population. It was noted that the twin growth standards depend on the population characteristics and model structure. The data demonstrated that the use of singleton standards for twin pregnancies inadequate.