Considers areas of consensus from commentaries, including the value of an evolutionary perspective and the utility of exploring variations in physical activity play. Examines areas of debate, including the nonplay-play distinction, functions of rough-and-tumble play, and the opportunities of juveniles for exercise training. Calls for more directed…

Reviews significant recent research and information related to the beginning period of human life, and specifically discusses the developing fetus and infant, and the surrounding environment in which the infant is born and reared. Suggestions for prevention of mental-health problems are offered. (Author/DB)