Children diagnosed with autism spectrum disorder around their third year usually present deficits in non-verbal communicative behaviors at one year of age. Such deficits keep them from engaging in reciprocal social exchanges with their caregivers, which causes severe impairments in their development. Early intervention based on a developmental approach focuses on these inicial deficits in order to minimize late impairments caused by them. The present study aims at assessing an early intervention program, which was based on the Klinger & Dawson (1992) program, modified according to the results from a homevideo study by Osterling & Dawson (1994) and a joint attention research by Carpenter, Nagell & Tomasello (1998). The participants were two 33- month-old children diagnosed with autism spectrum disorder and their respective caregivers. The intervention program consisted in facilitating the development of sixteen preverbal behaviors by these children. It was effective: one of the children developed nine behaviors while the other one developed six.