Every baby’s developmental level is different, but within a certain range can fluctuate, parents do not need to be too anxious. 3-week-old babies will probably be able to have the ability to: 1, large motor, 3-week-old babies can go up and down the stairs alternately, able to stand on tiptoe single-legged, but also can jump far, and a kind of emotion that wants to jump high; 2, fine motor, 3-week-old babies can mimic the drawing of crosses, draw circles 3, language, language has six directions, 3-week-old babies can say their own names, can say complete sentences as well as their own gender, but also understand the concept of you, I, he; 4, cognitive, 3-week-old babies can at least identify long, short, as well as before, after, and will also be able to count the number of digits, can be counted to 1, 2, 3; 5, social interactions, 3-year-old children like to play group games with other children, know the order, as well as know the queue Social interaction, 3-year-old children like to play group games with other children, know the order, as well as know the concept of queuing; 6, the child’s ability to take care of themselves, such as 3-year-old children know to wash their own hands, to dry their hands, and finally, they will also be able to buckle their own buttons. The above is the 3-year-old baby’s intellectual development performance, parents can according to their own children’s performance related training and training.