Statistical analysis
The sample size calculation was based on a study conducted in children aged 24 months in a neighbouring district, which yielded an SD of 11·5 g/L for haemoglobin concentration.We used a per-protocol analysis including only children who had consumed at least 90% of the supplements, corresponding to supplement intake on at least 75 days during the study, to assess non-inferiority of the primary outcome at day 84 using a one-sided All statistical analysis was done in Stata (version 15.1). This trial is registered with the ISRCTN registry, ISRCTN07210906.