In this chapter, we provide an overview of past and current research on developmental phonetics. We situate our work within the body of literature on child language phonetics and phonology, which describes speech production patterns, often in the context of other aspects (e.g. phonological, lexical) of the child’s larger linguistic system. Research on phonetic development poses unique challenges, in particular concerning the modelling of the child’s constantly evolving linguistic abilities, which take place in the context of other aspects of the child’s development. We discuss areas of interaction between phonology and other aspects of children’s linguistic behaviours, including how issues affecting speech articulation may influence the emergence of phonological processes, covert contrasts in production, and individual patterns of lexical selection and avoidance. Throughout this discussion, we review methodological approaches to developmental phonetics, from traditional, corpus-based investigations to more recent developments in instrumental studies of child speech, and discuss their contributions to our understanding of phonetic and phonological development in child language.