This study tested the safety and efficacy of transfusing erythropoietin (Epo) and iron in infants of <1,250g birth weight. For infants 401-1,000g birth weight, we tested whether early erythropoietin (Epo) and iron therapy would decrease the number of transfusions received. For infants 1,001-1,250g birth weight, we tested whether early erythropoietin (Epo) and iron therapy would decrease the percentage of infants who received any transfusions.