Fathers' infant-directed speech and its effects on child language development

Infant-directed speech (IDS), a speaking style distinguished by its higher pitch, slower tempo, and exaggerated intonation, has been documented in speech directed towards infants across many cultures and languages. Previous research shows that IDS in the context of parent-infant interactions is associated with advances in children's language learning. While we have long known that fathers, like mothers, produce IDS, most research on IDS to this day has focussed exclusively on female (maternal) speech. In light of the recent societal changes which have increased fathers' time spent in hands-on activities with children, I argue that the research on IDS needs to move away from using the maternal template. I first describe why IDS plays a central role in language development. I then outline known similarities and differences between paternal and maternal IDS, and point to potential biases and challenges within the research that has been conducted so far. Finally, I outline why investigators should strive to include fathers in research on IDS, and conclude with recommendations for follow-up work that can help advance our understanding of fathers' contributions to children's linguistic development.