Presents evidence from Inuktitut, a null subject language, on optional infinitive production in typically developing (TD) children and children with specific language impairment (SLI). Shows TD children learning Inuktitut did not go through an OI stage, while one child with SLI does. Implications are discussed for theories of continuity, the initial stage of child grammar, and effect of language structure and input on language acquisition. (Author/VWL)