Backgound: Community outreach workers support individuals accessing healthcare and other services useful to respond to their needs. Even though community outreach workers have been working in the province of Quebec (Canada) for the past 40 years, their practice is poorly documented (especially for families having children aged 0 to 5 years). Methods: To document community outreach practice and its perceived impacts for children and families, a content analysis was performed on 55 scientific and grey literature documents, 24 individual interviews, and 3 focus groups including parents, community outreach workers, healthcare employees, and inter-sectoral partners. Results: Three main themes were highlighted: 1) characteristics of the population served, 2) concrete actions performed by community outreach workers, and 3) perceived impacts of community outreach on families and children. Community outreach workers were perceived to be essential for reaching out families with vulnerable circumstances and children with special needs. With respect to actions, community outreach workers were reported to tailor their interventions to respond in different but complementary ways to the healthcare system. Perceived impacts included increased access for children and families to services, decreased social isolation, increased parental abilities, increased social capital of families, and confidence towards the healthcare system. Conclusions: Results also showed that community outreach workers helped to reduce social inequalities in health. This social practice helped to augment the capacity of the healthcare system to fulfill its legal mandate to protect citizen and increase health and well-being. It is crucial that community outreach practices and proximity approaches be encouraged and sustained.