The performance of 122 children on syntactic awareness of clitics and articles in French was examined. Three clinical groups (21 children with ASD, 22 children with SLI, 23 children with DD) and a group of 56 younger children with TD were studied. On the article task, children with ASD obtained lower scores than all the other groups and on the clitic task they performed worse than children with DD. In addition, children with ASD and low expressive language displayed more difficulty than children with SLI on the clitic task. Thus, a subgroup of children with ASD is taxed in an area that is critical to identify children with SLI.