Early childhood development encompasses ages 2 to 7 years old and involves simultaneous development in physical, cognitive, and socio-emotional domains. Physically, children gain improved motor skills like balancing, hopping, and pedaling during this period. Cognitively, they develop abilities like symbolic thinking, perspective-taking, and basic math and literacy skills. Socio-emotionally, children learn to recognize and manage emotions, form friendships, and develop gender identity and basic moral understanding. Language acquisition also rapidly expands during early childhood.