? From the second half of life, children learn to hold things with their thumb and forefinger, which is a crucial step in the development of hand movements and lays the foundation for the development of writing and painting skills. Generally speaking, children can draw after they are one year old. After 2 years old, children will use pencils or crayons to draw some circles or straight lines, and try to express things around them with simple lines drawn by themselves. At this time, children have entered a critical period of developing their writing and painting skills.