A Preliminary Longitudinal Study on Infant-Directed Speech (IDS) Components in the First Year of Life.

Infant-directed speech (IDS) is an essential factor of mother-infant interaction and facilitates early language processing and word learning during dyadic interactions. This study aimed to longitudinally investigate emotional and prosodic components of IDS in the first year of life by analyzing children's responses to the different prosodic trends that mothers use during the observation of mother-child interactions. Seventeen mothers and infants were recruited for this study during their first hospitalization.