This research presents a German adaptation of the American MacArthur-Bates Commmunicative Inventory (CDI) for toddlers, with the addition of a detailed inflectional morphology scale. The name of the instrument is FRAKIS (Fragebogen zur frühkindlichen Sprachentwicklung). The research presents the first norm data of early language development for German-speaking children. Results of the study confirm the enormous variability in early language development found in other languages for German. There was also a strong relation between lexical and grammatical development, including between specific lexical and grammatical areas. The instrument FRAKIS is an excellent tool for assessing language level in young children, be it for research purposes or in clinical settings.