Some authors held the perspective that, beyond language acquisition, IDS significantly influences infants’ cognitive and emotional development (e.g., [4,176]). Our systematic review supports this view. More studies are needed to understand how IDS impacts affective factors in infants and how this is linked with infants’ cognitive development, however. An interesting approach may be to investigate how this process is altered by infants’ communicative difficulties, such as early signs of autism spectrum disorder, and how these alterations may affect infants’ development [177].