Infant neuropsychiatric development process Age coarse and fine motor language ability to adapt to the surrounding characters and behavior of newborns irregular, uncoordinated movements; clenched fist can cry ringing so that the whole body activity is reduced February upright and prone position can lift the head to make harmonious guttural sounds can smile and have facial expressions; eyes turn with the object March supine position into lateral position. Can touch things with hands and babble and pronounce sounds; head can turn 180° with objects seen or sounds heard; pays attention to own hands; can sit while holding hips in 4th month; can lift chest with two-handed support in prone position; can hold toys in hands and laugh and grasp objects in front of him; plays with hands by himself and expresses joy when seeing food; more conscious crying and laughing; can stand straight while holding armpits in 5th month; can mumble word syllables while holding a toy in each hand and reach for objects Can recognize other people’s voices; looks at people in the mirror and smiles; can sit alone for a while at 6 months; shakes toys with hands; can recognize acquaintances and strangers; pulls clothes by himself; holds his own feet to play; can roll over at 7 months; sits alone for a long time by himself; changes toys from one hand to the other; can say “Daddy” and “Mommy”, etc. Can repeat simple syllables from adults; begin to recognize objects; can pass toys between hands; can try to stand alone in September; can take toys out of drawers; can understand several complex words and phrases, such as “goodbye “Seeing acquaintances, they will ask for a hug; or play cooperatively with others. 10 to 11 months can stand alone for a moment; can walk a few steps holding a chair or stroller; thumb and index finger to finger to hold things begin to use words, a word means a lot of meaning can imitate the actions of adults; wave, “goodbye”; hold a bottle to feed themselves 12 months walks alone; bends down to pick up things; can put a round set on a stick can call out the names of objects, such as lamps and bowls; points out their hands and eyes have likes and dislikes of people and things; can cooperate in dressing and drink from a cup 15 months walks well; can squat and play; can stack a square piece of wood can say several words and their names can express agreement and disagreement 18 months can climb steps; throw a ball with a goal can recognize and point out body name parts can express urinate and defecate; understand commands; can feed themselves 2 years old can jump on both feet; more accurate hand movements; can eat with a spoon can say sentences made up of 2 to 3 words can complete simple actions, such as picking up objects on the floor; can express happiness, anger, fear and understanding 3 years old can run; can ride a tricycle; can wash hands and face; take off and put on simple clothes can say short rhymes and count a few things can recognize things on a picture; recognize male and female; call themselves “I”; show self-esteem, sympathy, shyness 4 years old can climb ladders; can put on shoes can sing can draw portraits; initial thinking problems; strong memory, good questions 5 years old can jump on one foot; can tie shoelaces begin to read and write can distinguish colors; count 10 numbers; know the purpose and properties of objects 6 to 7 years old to participate in simple labor, such as sweeping, cleaning tables, cutting paper Can tell stories; begin to write; can count to dozens; can add and subtract simply; like to be independent.