 Further evidence of young infants using prosodic cues is their ability to discriminate the acoustic property of pitch change by 1–2 months old.Infants and young children receive much of their language input in the form of infant-directed speech (IDS) and child-directed speech (CDS), which are characterized as having exaggerated prosody and simplification of words and grammar structure.When interacting with infants and children, adults often raise and widen their pitch, and reduce their speech rate.