The data obtained in humans and rodents indicate that leptin stimulates fetal growth: decreased leptin levels in food‐restricted pregnant rats are associated with fetal intrauterine growth restriction 26, 27, whereas elevated leptin levels in obese mice are associated with fetal overgrowth 28, 29, and in vitro leptin stimulates amino acid transport in human placentas at the end of pregnancy 30, 31. Here, LEP is linked to fetal growth restriction.