text_1: 15-month-old girl.  At age 12 months she had a microcytic anemia (hemoglobin about 11, mean corpuscular volume about 68 with normal over 75) and I put her on iron for 3 months, but after that she was still anemic (about 12) and the mean corpuscular volume was not back to normal (it was about 73).  We did iron studies and a hemoglobin electrophoresis but these were normal.  Now she has microcytosis but no more anemia.  "Do you need to do anything more?"  "Do I need to check it again or how often?"
text_2: How should you evaluate an infant with persistent microcytosis?