The thinking mode of 3_4-year-old children is figurative thinking. At this time, children mostly rely on their senses to gain experience. General baby development includes language, science, sociality, big movements, fine movements and so on. At this time, children should be able to express simple sentences and understand others' simple expressions. Sociality: most children like to play alone, self-centered, and there is relatively little communication between peers; Science: able to recognize simple numbers and understand the meaning of numbers; Big movements and fine movements: can walk and run stably, and can pinch, grasp and clamp with two fingers and three fingers.