The study will be conducted in 28 sites in peri-urban Phnom Penh. Infants aged 6-12 months will be recruited. Upon consent and enrolment, baseline data will be collected from the participants. This will include demographics, morbidity, anthropometry (weight, height, mid-upper arm circumference, skinfolds), haematological and stool samples, dietary data (breastfeeding, food frequency and dietary diversity). Data will be collected monthly, and haematological samples will be collected again at endline.