That is, the education before the first grade of the baby includes early education (0~3 years old) and preschool (3~6 years old). Critical period, generally speaking, the critical period of the baby is 0~3 years old, also called sensitive period, during which the baby will be particularly effective in teaching! Please refer to the experience of Professor Yuan Ailing, an early education expert, and the family education plan for the sensitive period of 0~3 years old.