Baby talk

Baby talk is a type of speech associated with an older person speaking to a child or infant. It is also called caretaker speech, infant-directed speech (IDS), child-directed speech (CDS), child-directed language (CDL), caregiver register, parentese, or motherese.^{[1][2][3][4][5][6]}

CDS is characterized by a "sing song" pattern of intonation that differentiates it from the more monotone style used with other adults e.g., CDS has higher and wider pitch, slower speech rate and shorter utterances.^[7] It can display vowel hyperarticulation (an increase in distance in the formant space of the peripheral vowels e.g., [i], [u], and [a])^[8] and words tend to be shortened and simplified. There is evidence that the exaggerated pitch modifications are similar to the affectionate speech style employed when people speak to their pets (pet-directed speech).^[9] However, the hyperarticulation of vowels appears to be related to the propensity for the infant to learn language, as it is not exaggerated in speech to infants with hearing loss or to pets.^[9][8][10]