This text provides a comprehensive introduction to current thinking on language acquisition. Following an introductory chapter that discusses the foundations of linguistic inquiry, the book covers the acquisition of specific aspects of language from birth to about age six. Topics include the language abilities of newborns, the acquisition of phonological properties of language, the lexicon, syntax, pronoun and sentence interpretation, control structures, specific language impairments, and the relationship between language and other cognitive functions.At the conclusion of each chapter are a summary of the material covered, a list of keywords, study questions, and exercises. The book, which adopts the perspective of Chomskyan Universal Generative Grammar throughout, assumes a familiarity with basic concepts of linguistic theory.Maria Teresa Guasti is a Professor of Psychology at the University of Milan-Bicocca.