According to the developmental approach a deficit in the capacity of affectively engaging with others is basic to autism and its impairments in social engagement and developmental deficits. Developmental-based early interventions have targeted this innate deficit in order to minimize developmental deficits and to promote typical behaviors in children with autism and related disorders. The aim of this study was to design an intervention program to promote typical behaviors in early diagnosed autistic children through the support of affective engagement during social interaction. Participants were five 3-4-year-old children recently diagnosed autistic and their caregivers. The program targeted the development of affective engagement, six varieties of social interaction situation and twenty-five typical behaviors. Social interaction situations and typical behaviors were based upon previous work by Brazelton and Cramer, 1990; Carpenter, Nagell and Tomasello, 1998; García-Perez, Lee and Hobson, 1997; Klinger and Dawson, 1992; Leslie, 1987; Maestro et al, 2001; Osterling and Dawson, 1994; Tomasello, 2003 and Wainwright and Fein, 1996. Results showed that the program succeeded in developing affective engagement, social interaction and typical behaviors in every children. Nonetheless, social interaction and typical behaviors could differ among children depending on their degree of affective engagement.