Results from measurements of IGF-I in serum offetuses and preterm or term newborn infants have been morevariable, as some groups find no difference in serum IGF-Iconcentrations between the male and female genders [39, 40];others report higher IGF-I in girls than boys [41, 42].However, this gender difference has not been, up till now,described in IUGR neonates. The gene discussed is IGF1; the disease is fetal growth restriction.