Intellectual backwardness is one of the developmental risks in preterm infants, and studies have proven that the incidence of intellectual backwardness in preterm infants is higher than in normal infants. Therefore, it is very important to monitor the intellectual development of preterm infants to detect the problem early and intervene very early, because the earlier the intervention and rehabilitation, the better the results. So how can we parents detect the problem of intellectual backwardness of our children? Here we introduce some simple tests that parents should carefully observe according to their child’s corrected monthly age. Test 1: Visual tracking red ball or human face Infant lying on his back with his head in the middle position, use a 250px diameter red ball and gently shake it at 500px from the baby’s eyes to get his attention. Then slowly move in an arc to the left and right to observe the baby’s eyes and head follow the red ball movement. Normal: 1 month old baby’s eyeballs can follow the eyes, but the head may not turn; 2 months old baby’s eyes and head turn, left and right up to 45 degrees each; 3~4 months follow the left and right 90 degrees each, that is, turn 180 degrees. Abnormal: can’t gaze or chase, turn head range is small. Test two: pull sitting posture and head erection Infants lying on their backs with their heads in the middle position, the examiner supports the baby’s forearms on both sides and slowly pulls up the baby to 45 degrees to observe the head lifting situation, and then pulls to the sitting position to observe the baby’s vertical head. Normal: 1 month old baby’s head drops back when pulled up, and the head can be erected for 5 seconds in sitting position; 2~3 months old baby’s head drops back slightly, and the head can be erected for more than 15 seconds; 4 months old baby’s head and trunk are raised in a straight line when pulled up, and the head is erected steadily, and the head can be turned around to see. Abnormal: 1 month olds cannot hold their heads up; 2~4 months olds pull up with their heads dorsiflexed (obviously hanging back) and cannot hold their heads up. Test 3: Prone head lift and hand support Let the baby lie prone, tease with toys in front of the head, and observe the baby’s head lift and hand support. Normal: 1 month old baby’s head turned to the side; 2 months old baby can lift his head for a moment, chin off the bed; 3 months old baby lift his head more than 45 degrees, elbow (part) support; 4 months old baby lift his head 90 degrees, elbow support, can turn his head from side to side. Abnormal: 2~3 month olds cannot lift their heads, 4 month olds can’t lift their heads steadily and can’t use elbow support to keep their chests off the bed. Test 4: Reaching for objects The child is lying on his back or in a sitting position with a toy hanging in front of him, leading him to reach for it. Normal: 3 months old child has a sense of reaching, but can not reach; 4 months old child can reach, but not necessarily reach the toy, 5 months old child can reach the toy. Abnormal: 4 months old does not tend to reach for things, 5 months old will not reach for things. Test 5: Turning over The child is lying on his back (wearing thin clothes) and is teased with toys to turn over to one side. Normal: at 3 months, the child is aware of rolling over and can roll over to the side; at 4 months, the child can roll over from supine to prone position. Abnormal: 4 months old has no sense of turning over, 5 months old can not turn to the side, 6 months old can not turn from supine to prone position. Test 6: Sitting forward 5-6 months will not be abnormal. Test 7: Interaction and emotion Face to face communication with the child and observe his performance. Normal: 2 months old children can have spontaneous smiles and make tiny guttural sounds; 3 months old can tease and pronounce sounds; 4-5 months old are interested in things around them, 6 months old can recognize familiar people. Abnormal: 3 months old can’t smile when teased face to face; 4 months old can’t vocalize; 5 months old has no interest in surrounding things; 6 months old has indifferent expression and no special reaction to people who take care of him. Parents should follow some simple tests above, and if they find suspicious abnormalities in their children, they should seek early medical attention and early rehabilitation treatment, which will be very effective. If possible, it is best to go to some specialized institutions for some monitoring and special training, and parents must also actively participate in the intervention, so that better results can be achieved. The earlier the detection, the better the effect of intervention. The main emphasis in early comprehensive intervention is that parents must give early sensory reinforcement stimulation, visual and auditory training, in addition to red balls, black and white cards and other toys, to give red light stimulation to those who do not have gaze performance. Secondly, face stimulation is also very important, we should often tease with the child face to face, use positive emotional expression and voice to guide the child to gaze, and gradually increase the frequency and intensity of stimulation. Other motor skills and hands-on training are the same as before. As long as parents actively intervene in the family, it has a very good effect on the prevention and control of intellectual backwardness.