**Cognitive Development:** - At 2-3 years old, children begin to grasp basic concepts such as shapes, colors, and numbers. - From 3-4 years, they can sort items and start to understand cause and effect. - Between 4-5 years, kids develop early reasoning and problem-solving skills. - By 5-6 years, they have stronger logical thinking and improved comprehension and memory abilities. **Language Development:** - Children aged 2-3 can use simple sentences and understand most of their daily conversations. - At 3-4 years, there's a significant increase in their vocabulary, and they can express more complex thoughts. - Kids aged 4-5 are able to clearly express themselves and understand longer dialogues. - By the time they are 5-6 years old, their language skills are almost at an adult level, allowing for deeper conversations. **Motor Skills:** - At 2-3 years old, children have well-developed gross motor skills like running, jumping, and climbing. - From the ages of 3-4, they are able to do more coordinated activities, such as squatting. - Between 4-5 years, their balance and coordination improve steadily, and they start to participate in small sports games. - By 5-6 years, they possess strong hand-eye coordination and can engage in more complex sports activities. **Social-Emotional Development:** - Around 2-3 years old, children start to play simple cooperative games and show signs of self-awareness. - At 3-4 years, they can express their emotions and begin to show concern for the feelings of others. - Between 4-5 years, their social skills are enhanced, and they start to form friendships. - By 5-6 years, they can initiate interactions with others and understand social rules and etiquette. In summary, the ages of 2 to 6 are key years for rapid growth and development in children. Parents should observe their children's individual needs and provide suitable resources and guidance to support their all-around development. Each child grows at their own pace, and these milestones serve as a general guide.