This paper attempts to demonstrate that children do not necessarily acquire fricatives before affricates. It begins with a summary and explanation of relevant parts of R. Jakobson's general theory of phonological acquisition. In part 2, an account of one child's acquisition of English affricates and fricatives is presented. In the period studied, the child had already mastered simple stops and had just acquired /ts/ and /dz/. She had the fricatives /s/, /z/, and followed various procedures in handling the rest of the English fricatives, which were difficult for her. The case was clearly a counterexample to the theory of fricatives before affricates. (Author/PMP)