GSTM1 and anemia (phenotype): Secondary outcomes are prevalence of anaemia (% Hb< 11.0 g/dL), mid-upper arm circumference (cm) and mean probability of micronutrient adequacy of 11 micronutrients including vitamin A, riboflavin (B2), niacin (B3), pyridoxine (B6), cobalamin (B12), thiamine (B1), folate (B9), vitamin C, iron, zinc and calcium.