At the age of 3 years: he could sit steadily, sit up from supine position then stand up when holding onto handrails. He could practice horizontally walking quite well while holding onto handrails and even step on one bar. He could take step with one hand held, switch a toy between hands, and pick up small pills with thumbs and index fingers. He could take off clothes with both hands. He could cover his face with clothes and towel to play peekaboo with an adult. He could follow guide to watch the objects an adult points to. He could repeat one motion from adults, take out food from a pocket, understand simple words, and play with other children in the playroom of the kindergarten. He could be cooperative with putting on clothes. He knows the motions of welcoming and goodbye and the game of pinching fingers. When being cuddled by an adult, he could automatically kiss him or her. He could eat all kinds of food. He is shy when being called his name and covers his face with both hands. He likes playing balls, finger game. He is extroverted.