This book offers a systematic study of the emergence and early development of compound nouns in first language acquisition from a cross-linguistic and typological perspective. The language sample is both genealogically and typologically diversified, ranging from languages rich in compounds, such as German, Saami, Estonian and Finnish, to languages poor in compounds, such as French. Some of them differ in compound richness according to genres of adult-directed speech in contrast to child-directed speech and thus also child speech, like Russian, Lithuanian and especially Greek. Differences in the delimitation and transition between compounds and phrases and in the distribution of subtypes of compounds in these languages involve great typological variety and thus different tasks for children acquiring them. The eleven languages investigated in the volume and the common methodology of longitudinal collection of spontaneous speech data concerning the interaction between children and their caretakers or peers, supplemented by lexical typology as a new means of cross-linguistic comparison of language acquisition, allow new generalizations.