A mother brings in her 16-month-old boy because she is concerned that he appears pale. Vital signs are within normal limits for age except for a mild tachycardia. He appears pale on physical exam, is irritable but consoles appropriately, and appears tired. You hear a systolic flow murmur and tachycardia on cardiac exam, but otherwise, physical exam is normal. Laboratory testing reveals the following:
What is the best treatment for this child's anemia?
-Oral ferritin supplementation
-Oral iron supplementation
-Packed red blood cell transfusion
-Parenteral iron transfusion