Breastfeeding rates in Kenyan slums are often low due to various socio-economic factors. A longitudinal study using data from 10 randomly selected slums in Nairobi with baseline and follow-up surveys conducted annually. The intervention involving regular home visits by CHWs significantly increased breastfeeding rates from 45% to 62% over the five-year period, particularly among mothers with lower education levels. Community health workers play a crucial role in improving breastfeeding practices in Kenyan slums and can be scaled up as an effective public health intervention. Implementing CHW programmes should focus on regular home visits targeting low-educated mothers to maximise the impact of breastfeeding promotion initiatives.