I don't think it is necessary for children to have small classes in kindergarten. Usually, when they start kindergarten at the age of three, they have to go to school earlier. At that time, children were still young, and they liked to move around and imitate others, so they could not concentrate. Moreover, children's language system has not been fully constructed, and it is difficult to communicate with them. At the same time, letting children start school early and shortening the stage of their free development and unrestrained will kill their nature early and make them less naive.