Research shows that communication with children, even about daily topics, helps them have healthier behavior and learn through the nonjudgmental way. It can improve their and their families’ lives. They also learn about themselves and the world around them by having conversations with their parents and others.
This link,includes a brief explanation about conversation and its role in positive parenting.
UNISEF has a report that explains how conversation with children helps them grow up healthier.
Furthermore, University of Missouri has a topic about conversation with children, which explains in detail how you can communicate with your child in different ages.