Too much preschool can be too much

Being in preschool for more than six hours a day can be damaging to a young child's social and emotional development compared to children who stay home with their parents, researchers at the University of California-Berkeley, and Stanford University have concluded...

On average, the report found that the earlier children enter preschool, the slower their pace of social development, while cognitive skills are stronger when children are first enrolled between the ages of two and three.