Maternal nutrition is a critical determinant of infant health in Nairobi slums, where access to adequate nutrition during pregnancy and early childhood significantly influences mortality rates. The review synthesizes existing literature, focusing on quantitative data from randomized controlled trials and observational studies conducted over several years in Nairobi’s slum areas. Despite promising initial results, sustained policy commitment is essential for translating maternal nutrition policies into effective interventions that significantly impact infant mortality rates in Nairobi slums. Investment in public health campaigns and community-based support systems should be prioritised alongside policy implementation to enhance compliance and efficacy of maternal nutrition programmes.