A longitudinal study of feeding practices of and morbidity in 537 infants was undertaken. Feeding practices were assessed at monthly follow-up visits. All infants were initially exclusively breastfed but their percentage dropped to 59.8% and 35.3% at the end of 3 months and 6 months respectively. Exclusively breastfed babies were three-times less likely to fall sick than artificially fed babies. Exclusive breastfeeding was also associated with significantly lowered rate of serious illnesses as shown by fewer rate of hospitalisation (0.52/100 children months vs 4.5/100 children months). Premature introduction of supplementary feeding diluted the protective effects of breastmilk.