Some twenty experts contributed to this special issue on early childhood and social inequalities in health. This issue is coordinated by Nathalie Houzelle, Pilar Arcella-Giraux, and Thomas Saïas. Numerous grassroots programs are featured, particularly those addressing substandard housing (Bouches-du-Rhône and Aubervilliers, in Seine-Saint-Denis). Also included in the issue, under the following headings: a section on the theme of “promoting the health of people with disabilities,” with examples of initiatives.