Elevated IL-2 (OR=1.027; 95%CI: 1.011-1.044; P=0.001) and reduced IL-4 (OR=0.963; 95%CI: 0.929-0.999; P=0.042) and IL-13 (OR=0.978; 95%CI: 0.962-0.995; P=0.009) were independently associated with IUGR. The gene discussed is IL13; the disease is fetal growth restriction.