Résumé : The prevalence of overweight in children has markedly increased over the past few decades in France, as in all Western countries. We sought to describe the yearly prevalence of childhood overweight from 1996 to 2006 and to assess whether a shift in trends could be observed dating from the time the Nutrition and Health National Program (PNNS) was set up in France in 2001, in particular according to gender, age and family economic status.