“…Several factors associated with ART are known to predispose to preterm birth, such as the high incidence of multiple gestational pregnancies and maternal comorbidities that include gestational diabetes and hypertensive disorders of pregnancy ( 2 , 6 , 17 , 18 , 19 ). It has been postulated that these maternal conditions are an expression of an adverse maternal-fetal environment (AMFE) ( 20 , 21 , 22 , 23 ). Although it has been shown that the increasing adoption of single embryo transfer led to a decrease in multiple gestation, the effect of multiple gestation and AMFE on the increased rates of prematurity in neonates conceived with the help of NIFT or ART has never been quantified.…”