Because children's own resistance is the weakest before they are three years old, and kindergartens are public places, even the best kindergartens will not take care of children one-on-one like home. From this perspective, it is not appropriate to send children to kindergarten before the age of three.
Emotionally speaking, the younger the child is, the stronger the anxiety of being separated from his parents. If he sends his child to kindergarten before he is three years old, this anxiety of separation will affect the child's eating, and then affect the child's developmental ability and disease resistance, so that the child is prone to illness.
One more thing, going to kindergarten before the age of three can easily lead to emotional problems. When children are sent to kindergarten before the age of three, they are more likely to have bad behavior and have lower ability to deal with stress when they grow up.