The field of language acquisition is divided over the question of whether the inborn mechanisms underlying linguistic development include actual grammatical categories and principles or are of a more general character. Recent proposals suggest a possible convergence of views on this matter, with implications for the study of both first language acquisition and second language learning. This paper explores this possibility by examining the evolution of grammatical nativism with particular emphasis on a radical shift in the generality of the inborn principles that have been posited in recent work. The nature and implications of this shift are illustrated with the help of developmental data involving gap-containing structures in first and second language acquisition.