A young child's stress-sensitive neurobiological system is immature and open to being shaped by experience. When children enter preschool, external demands on them to adjust are different from the demands they experience at day care. In Finland, the last year before children transfer to the comprehensive school is called preschool. The preschool…

Demand for child care services has grown steadily over the last few decades due to demographic trends, public policies, newly discovered links between brain development and early environments, and the number of parents entering the labor market for reasons such as welfare reform. As a result, most U. S. children under five spend time on a regular…