This article presents an autosegmental analysis of the development of pitch phonology in Swedish and Japanese, which mark both lexical accent and phrasing through movements in fundamental frequency (F0). Predictions that follow from the autosegmental model are tested against spontaneous production data from child Japanese. In support of the analysis that lexical pitch accent and phrasal intonation are acquired as separate sequences of tonal features, the falling and rising slopes of F0 contours

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... are shown to develop independently. The late emergence of the phrase-initial rise is attributable to the allophonic surface realisation of the low boundary tone. Moreover, developments in contour shapes are characterised by demarcated emergence of F0 turning points that are aligned with specific segments, providing further support for the view that pitch phonology is acquired as strings of tonal units associated with segments and prosodic constituents.