Premature and abstruse education or instruction affects the child's health while delayed and plain education or instruction may postpone and affect, even hinder the child's development. The period from two to three years of age is the crucial stage for children to develop oral language and counting ability; the period from birth to four years of age is the critical stage to develop morphological perception; the period from four to five years of age is the key stage to study written language; the period from five to six years of age is the vital stage to master vocabulary with the quickest speed as well as the vital age to develop digital concept. The content and requirement of education and training should be suited to the speed of the child's development. A large number of activities to learn characters and calculation are not generally advisable for children below five years old. The above-mentioned opportunities should be appropriately seized at the right time. Only in this way can the best effects be achieved.