Carmen Matzenauer is Visiting Professor at the Federal University of Pelotas, Brazil, and a 1A researcher for the Brazilian National Research and Development Council (CNPq). She has a PhD in Linguistics from the Pontifical Catholic University of Rio Grande do Sul, Brazil. Her teaching activities include phonology and language acquisition subjects, as well as supervising master's, doctoral and post-doctoral students. She carries out research in the field of linguistics, with an emphasis on phonology and phonetics.Cristiane Lazzarotto-Volcão is Full Professor in the Department of Vernacular Language and Literature and a professor and researcher in the Graduate Program in Linguistics at the Federal University of Santa Catarina (UFSC), Brazil. Additionally, she holds a research fellowship at the Linguistics Center of the University of Lisbon, Portugal. As a member of the Speech Department of the Brazilian Society of Speech-Language Pathology and Audiology, she has contributed significantly to her field.Maria João Freitas is Full Professor at the School of Arts and Humanities, University of Lisbon, Portugal, a researcher at Centro de Linguística (CLUL), and Director of the Doctoral Program in Linguistics at the University of Lisbon, Portugal. She participated in national projects headed by the Ministério da Educação and in national and international projects supported by public institutions. Teaching activity includes curricular units on phonology and on language acquisition. Her research interests are in the fields of phonological acquisition, clinical linguistics and educational linguistics. Her research is currently supported by FCT UID/214/2025.

• IntroductionChapter 1. Theoretical models for phonological developmentChapter 2. Production in typical phonological development: segmental aspectsChapter 3. Production in typical phonological development: suprasegmental aspectsChapter 4. Production in atypical phonological developmentChapter 5. Perception acquisition in Portuguese: identification of phonological contrastsChapter 6. Phonology and early writing: developmental paths in Brazilian and Portuguese childrenChapter 7. Portuguese phonology in bilingual childrenChapter 8. Portuguese L2 Phonology

Carmen Matzenauer is Visiting Professor at the Federal University of Pelotas, Brazil, and a 1A researcher for the Brazilian National Research and Development Council (CNPq). She has a PhD in Linguistics from the Pontifical Catholic University of Rio Grande do Sul, Brazil. Her teaching activities include phonology and language acquisition subjects, as well as supervising master's, doctoral and post-doctoral students. She carries out research in the field of linguistics, with an emphasis on phonology and phonetics.Cristiane Lazzarotto-Volcão is Full Professor in the Department of Vernacular Language and Literature and a professor and researcher in the Graduate Program in Linguistics at the Federal University of Santa Catarina (UFSC), Brazil. Additionally, she holds a research fellowship at the Linguistics Center of the University of Lisbon, Portugal. As a member of the Speech Department of the Brazilian Society of Speech-Language Pathology and Audiology, she has contributed significantly to her field.Maria João Freitas is Full Professor at the School of Arts and Humanities, University of Lisbon, Portugal, a researcher at Centro de Linguística (CLUL), and Director of the Doctoral Program in Linguistics at the University of Lisbon, Portugal. She participated in national projects headed by the Ministério da Educação and in national and international projects supported by public institutions. Teaching activity includes curricular units on phonology and on language acquisition. Her research interests are in the fields of phonological acquisition, clinical linguistics and educational linguistics. Her research is currently supported by FCT UID/214/2025.

• IntroductionChapter 1. Theoretical models for phonological developmentChapter 2. Production in typical phonological development: segmental aspectsChapter 3. Production in typical phonological development: suprasegmental aspectsChapter 4. Production in atypical phonological developmentChapter 5. Perception acquisition in Portuguese: identification of phonological contrastsChapter 6. Phonology and early writing: developmental paths in Brazilian and Portuguese childrenChapter 7. Portuguese phonology in bilingual childrenChapter 8. Portuguese L2 Phonology

Carmen Matzenauer is Visiting Professor at the Federal University of Pelotas, Brazil, and a 1A researcher for the Brazilian National Research and Development Council (CNPq). She has a PhD in Linguistics from the Pontifical Catholic University of Rio Grande do Sul, Brazil. Her teaching activities include phonology and language acquisition subjects, as well as supervising master's, doctoral and post-doctoral students. She carries out research in the field of linguistics, with an emphasis on phonology and phonetics.Cristiane Lazzarotto-Volcão is Full Professor in the Department of Vernacular Language and Literature and a professor and researcher in the Graduate Program in Linguistics at the Federal University of Santa Catarina (UFSC), Brazil. Additionally, she holds a research fellowship at the Linguistics Center of the University of Lisbon, Portugal. As a member of the Speech Department of the Brazilian Society of Speech-Language Pathology and Audiology, she has contributed significantly to her field.Maria João Freitas is Full Professor at the School of Arts and Humanities, University of Lisbon, Portugal, a researcher at Centro de Linguística (CLUL), and Director of the Doctoral Program in Linguistics at the University of Lisbon, Portugal. She participated in national projects headed by the Ministério da Educação and in national and international projects supported by public institutions. Teaching activity includes curricular units on phonology and on language acquisition. Her research interests are in the fields of phonological acquisition, clinical linguistics and educational linguistics. Her research is currently supported by FCT UID/214/2025.

• IntroductionChapter 1. Theoretical models for phonological developmentChapter 2. Production in typical phonological development: segmental aspectsChapter 3. Production in typical phonological development: suprasegmental aspectsChapter 4. Production in atypical phonological developmentChapter 5. Perception acquisition in Portuguese: identification of phonological contrastsChapter 6. Phonology and early writing: developmental paths in Brazilian and Portuguese childrenChapter 7. Portuguese phonology in bilingual childrenChapter 8. Portuguese L2 Phonology