Among children under five, anemia is classified into mild (haemoglobin [Hb] =10.0–10.9 g/dL), moderate (Hb = 7.0–9.9 g/dL), severe (Hb < 7.0 g/dL), and normal (Hb ≥ 11.0 g/dL) Hb level concentration for children aged 6 to 59 months [2]. This evidence concerns the gene GSTM1 and anemia (phenotype).