In our school, children are all under three years old, because most of them can't take care of themselves, and there are many places where teachers need help, such as going to the toilet and eating. Teachers need to spend more energy. A kindergarten teacher has one or two more teachers than other classes, so the cost of kindergarten is much higher than that of small classes and above. If no one takes care of the children, it is better to go to kindergarten at the age of three. After all, children know more and understand more when they are older.