8-month-old male infant is brought in for routine checkup by his mother. The child is pale, but other than that, looks healthy, with growth parameters within the expected range. The mother informed that boy was breast fed for three months, followed by cow's milk substitute. For the last two months, she started giving him fruits and vegetables; however, she still hasn't introduced eggs and milk into the boy's diet. Complete blood count (CBC) shows hemoglobin (Hgb) level to be 9g/dL, mean corpuscular volume (MCV) of 65fL, increased total iron binding capacity (TIBC) and low serum iron. Neither mother nor father have a positive family history for any blood disorder. What is the best treatment?