Nothing is surer to bring smiles than watching a fit, happy baby wiggle and coo, or seeing a toddler, intent on trying out first steps. While it’s easy to recognize a happy baby or a sick child, what exactly makes up a fit and healthy baby? What are parents to do to insure that their children are growing up to be fit youngsters?

Dr. Ari Brown, MD, FAAP, shares her expertise about disease prevention and health and fitness in children. Dr. Brown is a nationally known pediatrician with a...