if the cause of iugr is extrinsic to the fetus (maternal or uteroplacental), transfer of oxygen and nutrients to the fetus is decreased. this causes a reduction in the fetus’ stores of glycogen and lipids. this often leads to hypoglycemia at birth. polycythemia can occur secondary to increased erythropoietin production caused by the chronic hypoxemia. hypothermia, thrombocytopenia, leukopenia, hypocalcemia, and pulmonary hemorrhage are often results of iugr.