GSTM1 and malaria: The main findings of this study are: a) toddlers receiving iron supplementation with a two weeks delay did not absorb significantly more iron over the eight week supplementation period than the group starting supplementation immediately after treatment; b) in post-malarial anaemia, the first dose of iron supplementation is not better absorbed when given two weeks after malaria treatment than directly after treatment; and c) Hb concentration increased during the first two weeks after malaria treatment, with and without iron supplementation.