This document summarizes the results of a study on the social return on investment (SROI) of a nutrition intervention program in urban poor settings in Nairobi, Kenya. The study found that the intervention led to many benefits, including improved breastfeeding practices, increased male involvement in childcare, and reduced illness in children. It also identified some negative outcomes, such as women foregoing work to breastfeed. The SROI ratio calculated was $71 for every $1 invested, indicating high social value. While the intervention showed success, future programs should address potential negative impacts and support combining work with breastfeeding.