Community-based early childhood care programmes have been implemented in Nairobi slums to address developmental needs of children under five years old. A mixed-method approach was employed, including quantitative surveys and qualitative interviews. Data were collected through structured questionnaires administered to parents/guardians and teachers in selected schools over two academic years. Significant improvements in child development indicators (e.g., cognitive skills) were observed at the end of the study period, with a mean improvement rate of 15% across all monitored areas. The replication study confirms the positive impact of community-based early childhood care programmes on child development outcomes, supporting their efficacy as an intervention strategy in Nairobi slums. Further research should explore long-term impacts and scalability of these programmes to broader populations in similar socio-economic contexts. Community-Based Programmes, Early Childhood Care, Nairobi Slums, Longitudinal Studies, Child Development The empirical specification follows $Y=\beta_0+\beta^\top X+\varepsilon$, and inference is reported with uncertainty-aware statistical criteria.