Child Stats.gov is a website that provides up-to-date statistics from 22 federal agencies on indicators of child and family well-being, including health, behavior, education, and family/social environment. The document discusses a longitudinal study from 2010-2011 that assessed kindergarten students' performance in reading, math, and science, accounting for gender, poverty status, and race. It hypothesizes that kindergarten students will score higher on cognitive assessments than children not attending kindergarten, demonstrating the importance of kindergarten in educational development.