A case study of a 2-year-old progressing normally in speech development provides evidence of suprasegmental marking of the plural, thought to be adopted only in language-impaired children. Acoustic analyses of the durations and intensity of elicited words indicate that the child had adopted a suprasegmental strategy for marking the singular/plural distinction. Factors that appear to contribute to this marking system include constraints on children's phonetic and phonological capabilities, the importance of number marking in children's morphological systems, the psycholinguistic motivation to increase phonetic output to signal plural, and the iconic quality of markedness, associating increased magnitude of suprasegmental parameters with a greater number of objects. (MSE)