A B S T R A C TSeveral descriptions of the transition from single to multiword utterances use prosody as an important diagnostic criterion. For example, in contrast to successive single-word utterances, 'real' two-word utterances are supposed to be characterized by a unifying intonation contour and a lack of an intervening pause. Research on the acquisition of prosody, however, revealed that control of the phonetic parameters pitch, loudness, and duration is far from complete at such an early stage. In this study, we examine the interaction between the development of different types of syntactic structures and their prosodic organization. Data from a detailed production record of a monolingual German-learning boy is analysed both auditorily and acoustically with a focus on four different types of two-word utterances produced between 2; 0 and 2; 3. Two major findings are reported here. First, the different types of two-word utterances undergo individual trajectories of prosodic (re-)organization, in part depending on the time course in which they become productive. This suggests that different types of [*] The data collection and research was carried out at the Max Planck Institute for Evolutionary Anthropology in Leipzig, which also provided a stimulating environment for working on our ideas. We are grateful to several transcribers, most notably Solvejg Kü hnert, Jana Jurkat, and Susanne Mauritz for their indispensable groundwork in transcribing the data, and to Anne Alexander for her help in the acoustic analyses of a part of the data. Of course, none of this would have been possible without the continuous good spirit of Leo and his parents. We would like to thank the audience at the International Association for Child Language (IASCL) in Madison/Wisconsin, July 2002 for their helpful comments and suggestions.