The prosodic characteristics of "motherese" were examined in the speech of 24 German mothers to their newborns. Each subject was recorded in three observational conditions, while addressing (a) her 3-to 5-day-oId baby (M-B Speech); (b) the absent infant, as if present (Simulated M-B Speech); and (c) the adult interviewer (M-A Speech). For each subject, 2-minute speech samples from each condition were acoustically analyzed. It was found that in M-B Speech, mothers spoke with higher pitch, wider pitch excursions, longer pauses, shorter utterances, and more prosodic repetition than in M-A Speech. Furthermore, 77% of the utterances in the M-B Speech sample conformed to a limited set of prosodic patterns that occurred only rarely in adult-directed speech, i.e., they consisted of characteristic "expanded" intonation contours, or they were whispered. The prosody of mothers' speech is discussed in terms of its immediate influence within the context of motherinfant interaction, as well as its potential long-range contribution to perceptual, social, and linguistic development.