Newborn: flexion or semi-flexion of limbs in supine position, hand clenched fist, symmetrical or asymmetrical (mainly in flexion), head to one side in prone position but not stable, whole body flexion with head as fulcrum in hip-high head-low position. When sitting, the whole body leans forward and the head is unstable. The hand clenches the thumb outside the four fingers, and the grip reflex may appear. 2 months: Head gyrates to one side or left and right, often with asymmetrical tension reflex (the child begins to shift from flexion to extension). The head is not raised permanently in the prone position, and the lower limbs are semi-extended in a hip-head equilibrium position with the neck and upper chest as the fulcrum, and can reach objects and kick alternately on their stomachs. Fingers are half-open and can look at objects in the hands and play with hands. 3 months: The head remains in a neutral position and can turn freely. Asymmetrical reflexes gradually disappear. In prone position, the head can be supported by the elbow, and the head can be raised at 45°. The lower limbs are extended, and the head is high and the hips are low with the chest and waist as the fulcrum. At the end of March, the head can grasp objects with the lateral side of the foot. 4 months: Not only the head is centered, but also the trunk is stable, and the limbs are more symmetrically flexed. Can reach out to actively grasp objects in sight, and loves to bite hands or other things. The head can be raised 45-90° in prone position, with the waist as the fulcrum. At 4 months of age, the lower extremities can be extended to support the weight and are more toe supported. 5 months: head is completely centered, limbs are symmetrically flexed, eyes begin to look at hands, finger random movements are obvious, can actively grasp the foot to eat, showing hand-mouth-eye coordination. In prone position, the head can be raised 90° with the support of both hands, with the lumbosacral as the fulcrum. In sitting position, the head is very stable. 5~6 months old, the limbs are jumping in standing position. 4~5 months old, the grasping objects are often uncoordinated and often held by all hands. 6 months: The limbs start to stretch freely, the random movement increases, and they can actively lift their legs and turn over from side to side. In prone position, they can stretch their fingers to support their weight, raise their head more than 90°, lift their chest and epigastrium out of bed, stretch their limbs freely, use the sacral tail as a fulcrum, and turn from prone to supine. Pulling hand can sit up from supine, can sit with hand forward support, in the shape of arch back sitting. 6~7 months can play with feet, change hands to play, radial palm grasp objects. 7 months: head free movement, free extension of limbs, supine turning into prone flexible, mainly stretching exercises. When prone position can be supported by both hands or one hand and can change hands to support, can sit alone straight waist sitting. 7 ~ 8 months can support standing. 8 months: can start to crawl, abdomen can not leave the bed, can turn in place and belly crawl. Can twist to sit and change from sitting position to other positions. 8~9 months: fingers are flexible and can pinch things, can grasp things with radial fingers. 9 months: can crawl, abdomen can leave the bed, can crawl back and forth. Can grasp standing. 10 months: can four crawl movement, and have a better sense of balance can stand alone. The fingers are very flexible, and the thumb and other fingers can pinch objects against each other. 11~12 months: can crawl high, start to pull hand walking at 11 months, and can walk alone at 12 months, including walking alone as early as 9 months and as late as one and a half years. Thumb and forefinger pinch, to pinch fine. At 1 year old, they are not very stable, and both upper limbs are often raised horizontally. 12~15 months old, they can take food with a spoon, no longer put things into the mouth, and can throw things upwards and turn pages of books. 1 year 3 months: can climb stairs, kneel steadily, stand up by themselves, walk around things is not yet flexible, can not suddenly stop. 1.5 years old: can go up stairs, still need both feet together when going up, need handrail when going down, can go backward, can pick up things, can stack 3~4 blocks. 2 years old: stable gait, can kick a ball with one foot, can walk to the side and back, can cross obstacles, can jump side-by-side, can stack 5~6 blocks, turn a book page by page, can turn a doorknob, drink from a cup, and undress. 2.5~3 years old: can count seconds independently on one foot, can take one step up stairs and two steps down, can ride a tricycle and start to put on socks and shoes, hold a pencil with a fist to draw straight lines and circles and slowly turn to imitate drawing a cross, and can unbutton and put on clothes. 4 years old: can stand on one foot for a long time, can jump rope, turn and jump, dress themselves, imitate drawing triangle. 5 years old: can jump 8~10 steps continuously. 6 years old: can jump and run well.