Inclusion Criteria:  Resident in the study municipality; Infants aged 6 to <9 months  Exclusion Criteria:  Severe obvious congenital abnormalities such as cleft lip and spina bifida; Severe anaemia (haemoglobin <70 g/L); Severe acute malnutrition (weight-for-length z-score < -3); Plans to move out of the study area in the next nine months; Known allergies/intolerances to eggs; Infants receiving special nutritional supplements as part of feeding programmes; Not been born as a singleton; Mother/legal guardian below 18 years old at the start of the study