As the old saying goes, “At the age of three, it depends on the young, at the age of seven, it depends on the old”, referring to the importance of early education at different stages of a baby’s life. This is also the reason why children of the same age can behave differently. The “three years old to see the small” refers to the child’s psychological characteristics and personality tendencies at the age of three weeks to see the prototype of their psychological and personality image when they grow up. From the perspective of educational psychology, the period from birth to 3 years old is called “infancy”, which is the most rapid period of physical development and psychological development of children. During this period, parental expectations, behaviors and some standards of life are internalized by the infant as his or her own system of expectations and rules. The period from 3 to 7 years old is called the “early childhood period (entering kindergarten)”, also known as the “preschool period”. The term “seven years old” means that at age seven, a child’s personality tendencies begin to take shape. Of course, the terms “three years old” and “seven years old” are not real but imaginary, but only mean that the child’s personality at this time will have a great impact on his future. In fact, no matter what kind of personality tendencies the baby has in the future, as parents we hope they can grow up healthy and happy every day, on top of that, if the baby can be more intelligent, flexible and knowledgeable is good on top of good. After all, as parents, everyone wants to make their children more intelligent. Therefore, to tap into the child’s intelligence, you also need to know which period is the child’s intellectual development leap period. The first peak of the baby’s intellectual development At about the fifth week of life, the organs of his organism mature rapidly and all the senses begin to work. For example, he starts to shed tears when he cries or to show happiness by smiling. He also observes and listens to everything that happens around him from time to time and reacts visibly to smells and movements. The second peak of the baby’s intellectual development At around the 8th week of growth, the baby discovers that his surroundings are not uniform and fixed, but consist of concrete things that move. This dazzling change frightens him. However, if you can often lie in the mother’s arms, with the mother to maintain close contact can be to a considerable extent to eliminate the emergence of fear. The third peak of the baby’s intellectual development In the 12th week or so, the baby discovers movement and recognizes the process of certain activities. As a result, his previously dull movements become flexible and he learns that he can control his own behavior. This also confirms his “skills”, as he squeals, laughs, learns to speak excitedly and tries to “talk” to his mother or others. The fourth peak of the baby’s intellectual development In the 19th week, he can already grasp things, turn or flip things he can reach, and watch the activity of objects. At this time he has to study everything – touch it with his hands or simply put it in his mouth. The fifth peak of baby’s intellectual development In the 26th week, he gradually understands the cause-and-effect relationship between things, such as pressing a button to hear beautiful music. At the same time, he has learned that: something can be placed inside another thing or outside a third thing; something can be near or far away. Therefore, the game he is most interested in is to take things out and move them in and make a mess of everything. The sixth peak of baby’s intellectual development In the 37th week, he can classify things abstractly, for example, he knows that dogs always “woof”, big dogs, small dogs, black dogs and white dogs. This shows that he is starting to use logical thinking like an adult. The seventh peak of baby’s intellectual development In the 46th week, he realizes that there is an order to everything he does, so his favorite game is “do it yourself”, i.e., to do a job in order. It was through this game that he learned to “do things” and to deepen his impression of the order. However, he also thinks that this order is fixed. The eighth peak of the baby’s intellectual development In his 55th week, he finally discovers that the order can be changed at will by his own decision. At this point, he is able to “make a plan” according to his own wishes and clearly indicate what he wants. Six months after birth is a critical period for the development of chewing ability, 8 months is a critical period for learning to distinguish size and number, 2 to 3 years old is the first critical period for learning oral expression, 2.5 to 3 years old is a critical period for teaching children to learn to do things with rules, 3 years old is a critical period for the development of numeracy, 3 to 5 years old is a critical period for the development of musical talent, 4 to 5 years old is a critical period for learning written language, 5 to 6 The critical period for vocabulary acquisition is from age 5 to 6, and from age 9 to 10 is the critical period for the change from consequence-oriented to motivation-oriented. 3 to 4 is the critical period for discipline development. As you can see, it is very critical for a person’s growth until the age of 10. And how to grasp the infant and toddler period is extraordinarily important. As mothers and fathers, if we know how to improve ourselves with a scientific attitude, we will be able to know that following the natural psycho-physiological development of our babies to implement education and develop their intelligence will be able to get twice the result with half the effort for their future!