Two delivery platforms for home visiting programs will be assessed as part of this trial: 1) the introduction of a newly trained cadre of Child Development Agents (CDAs); and 2) the integration of home visiting programs into the Family Health Strategy (PSF). For the latter, we will train selected Community Health Agents (CHA) currently employed by the Brazilian government under the Family Health Strategy program on child development and provide additional financial incentives for home visits. While this second option will be less costly, the quality of the delivered interventions may not be as high as the former. The developmental impact of both delivery mechanisms will be assessed. Impact data will be combined with detailed costing data to evaluate both the effectiveness and relatively cost-effectiveness of both platforms. Quantitative data on cost and developmental impact will be combined with qualitative feedback from mothers and community workers.The successful implementation of the pilot program may lead to a larger-scale efficacy and cost-effectiveness trial in Sao Paulo in the medium run, with the ultimate objective to establish similar programs at the national level in the long run.