Contents -- Preface -- Acknowledgements -- Conventions on Transcriptions -- Chapter 1 Language Universals and Crosslinguistic Studies of Phonological Acquisition -- Chapter 2 Putonghua Phonology -- Chapter 3 Phonological Acquisition of Normally Developing Children. I: Cross-sectional Study -- Chapter 4 Phonological Acquisition of Normally Developing Children. II: Longitudinal Study -- Chapter 5 The Phonological Systems of Putonghua-speaking Children with Functional Speech Disorders -- Chapter 6 Development and Change in the Phonology of Putonghua-speaking Children with Functional Speech Disorders -- Chapter 7 The Phonological Systems of a set of Putonghua-speaking Twins -- Chapter 8 Phonological Development of a Putonghua-speaking Child with Prelingual Hearing Impairment: A Longitudinal Case Study -- Chapter 9 General Discussion and Conclusion -- References -- Appendices -- Index.