If your child is between 0-3 years old. At an early age, a child’s objective activity can have a developmental effect only in collaboration with an adult. What is objective activity? These are actions with toys or household items. “I do like mom or dad, I also take a broom, switch the TV, wash the dishes...” Subject-based activity for children aged 0-3 years is a step that cannot be overstepped. This is the most favorable period for the development of a thinking, learning, inquisitive person. And such periods exist only in childhood. Use them and enjoy the development of your children. An adult creates a developmental effect for a small child. An adult is a bearer of knowledge and ways of how to communicate, how to play, what to want or not to want, what to play, what to read. An adult is the source of new meanings in a child’s life. The meaning of the child’s actions initially lies in the fact that it is carried out for the sake of fulfilling the instructions of an adult or next to him. It is the adult who conveys to the child both the method of action and the desire to carry it out, interest in it. In contacts with adults, the child learns the purpose of various objects, their properties and ways of handling them. So, in the process of daily regime procedures, the baby learns to use objects for utilitarian purposes (spoon, cup, comb, etc.), in everyday joint activities and games with didactic toys (pyramids, inserts), with the help of an adult, he becomes familiar with some sensory standards (shape, color, ratio of objects by size, etc.) and rules for their use. In games with story toys, he begins to act in a conventional way, reflecting in ways accessible to himself the actions of adults that he often observes (stirring soup, ironing clothes, driving a car...) Gradual mastery of these actions contributes to the development of all mental processes - perception, thinking, imagination, memory, attention, i.e. creates a developmental effect. Then why do some people succeed and want everything, while for others everything is not so. The most important answer is how the developmental effect was created?