The National Institutes of Health (NIH) Tackling Acquisition of Language in Kids (TALK) initiative seeks to support activities to better understand early language learning and delay. NIH TALK invites applications for research projects that aim to further understanding of the developmental trajectories of late talking children by leveraging existing data and creating open and shared data resources to aid in identifying patterns and predictors of developmental outcomes in late talking children, and exploring potential underlying mechanisms, risk factors, and sequelae. Late talking, also known as late language emergence, is diagnosed when a child, usually over the age of 18 months, is not meeting expressive language milestones, for any reason.