When babies are about 3.5 years old, their self-awareness has developed to a certain extent, and the parent-child relationship with their mothers has become stable and close after they have passed the rebellious period. According to the law of psychological development, when babies are 3.5 to 4 years old, their self-awareness will be well developed, so it is not recommended to send them to kindergarten early. At the age of 2-3 years old, the baby’s sense of self will gradually sprout and the first rebellious period of life will appear. If you send your baby to kindergarten at the age of 2-3, you will need to deal with the difficult issues of rebellious parent-child relationship and separation anxiety at the same time. For babies, experiencing the two major tasks of growing up with a sense of self and being separated from their mothers at the same time, the inner conflict is also great and the anxiety index will be higher, so it is recommended that it is more appropriate to send your baby to kindergarten at the age of 3.5 to 4.