The WHO classifies anaemia during pregnancy and puerperium (the first 6 weeks after childbirth during which the mother’s reproductive organs return to their original nonpregnant state) into three categories of severity: (1) mild anaemia (Hb levels 9 to 10.9 g/dL), (2) moderate anaemia (Hb levels 7.0 to 8.9 g/dL), and (3) severe anaemia (Hb levels less than 7.0 g/dL) [9]. The gene discussed is GSTM1; the disease is anemia (phenotype).