Psychological development is a development process from quantitative change to qualitative change and constant contradictory movement. People's life presents different contradictions in different periods. The emergence and solution of these special contradictions not only promote psychological development, but also form the essential psychological characteristics of different periods, which constitute the stage of psychological development. Educators and psychologists in China generally divide individuals from birth to youth into six stages according to the characteristics of psychological contradiction movement and referring to leadership activities and educational system.
(a) infancy (birth to 1 year, also known as lactation)
Babies are a stage of rapid development of personal feelings and behaviors. Babies often see their eye movements uncoordinated within two or three weeks after birth. About a month after birth, their eyes' uncoordinated movements disappeared, and the phenomenon of visual concentration appeared. 1 month old appears auditory concentration; Three and a half months, you can hear the sound and find the sound source; After nine and a half months, eye movement coordination appeared. Others, such as taste, smell and skin sensation, developed earlier and gradually completed after one month. About 3 months after the baby is born, there is involuntary touch of the hand; About five months later, due to the repeated touch of the hand, a learned touch action was formed. At this time, children began to use their hands as organs to understand things; After about half a year old, the hand movements have been further developed, and the baby can grasp objects with his thumb and the other four fingers.