Live births occurring before 37 completed weeks of gestation are classified as preterm or premature infants. Most weigh less than 2500 grams at birth, with head circumferences under 33 centimeters. Those exhibiting poorer organ function and adaptive capacity compared to full-term infants require specialized neonatal care.Infants whose birth weight falls below the 10th percentile for their gestational age or more than two standard deviations below the mean due to factors like placental insufficiency are termed small for gestational age (SGA, underdeveloped infants). Infants weighing less than 2500g at birth are collectively classified as low birth weight infants, while those weighing under 1500g are termed extremely low birth weight infants. Both categories include preterm and SGA infants.
Monitoring Cognitive Development in Preterm Infants
Early education starting from the neonatal period can promote cognitive development, maximize brain potential, and effectively prevent intellectual disabilities. Seize the critical window during the first two years after birth—when brain development is most rapid, plasticity is highest, and compensatory abilities are strongest—to implement comprehensive interventions that help correct developmental deficits.
While intellectual disability or cerebral palsy occurs more frequently among preterm infants, it is not universal. As parents, early intervention in your baby's intellectual development is crucial. Only through such proactive measures can intellectual disability in preterm infants be prevented.Parents can arrange for a cranial CT scan and electroencephalogram (EEG) for their premature newborn on the third day after birth, along with medications to promote neonatal brain cell metabolism.
Following medical advice, parents can provide effective stimulation for their baby's vision, hearing, and touch during their growth process. This enhances the baby's cognitive and language abilities. When intervening in the intellectual development of premature infants, parents should be patient and avoid rushing.Parents should not lose heart. As long as parents of premature infants seize the right timing, the intellectual development of premature infants can be on par with that of full-term babies and will not be inferior to them. How to Conduct Intellectual Tests for Premature Infants Test 1: Visual Tracking of a Red Ball or Face Place the infant supine with the head in a neutral position. Use a red ball with a diameter of 10 cm, gently moving it 20 cm in front of the infant's eyes to attract the baby's attention.Slowly move the ball in arcs to the left and right, observing whether the baby's eyes and head follow the ball's movement.
Normal: At 1 month, the baby can track the ball with their eyes but may not turn their head. At 2 months, both eyes and head turn, reaching approximately 45 degrees to each side. At 3–4 months, tracking extends to 90 degrees left and right, totaling 180 degrees.
Abnormal: Inability to fixate or track, limited head rotation range.
Test 2: Pull-to-Sit Position and Head Control With infant supine and head centered, the examiner supports the baby's forearms and slowly lifts to a 45-degree angle, observing head lifting. Then lift to a sitting position to observe head control.
Normal: At 1 month, head tilts backward when lifted; maintains upright position for 5 seconds in sitting. At 2–3 months, head tilts slightly backward but remains upright for over 15 seconds. At 4 months, head and torso lift in a straight line when pulled up, with stable head control and ability to turn head left/right.
Abnormal: 1-month-old cannot hold head upright; 2–4-month-old exhibits head hyperextension (marked backward tilt) when lifted and cannot hold head upright.
Test Three: Prone Head Lift and Hand Support
Place baby in prone position. Use a toy to attract attention just in front of the head. Observe head lift and hand support.
Normal: 1-month-old turns head to one side; 2-month-old briefly lifts head with chin off surface; 3-month-old lifts head over 45 degrees with elbow support; 4-month-old lifts head 90 degrees with elbow support and turns head left/right.
Abnormal: 2–3-month-old cannot lift head; 4-month-old lifts head unsteadily and cannot use elbows to lift chest off surface.
Test 4: Reaching for Objects
With baby lying supine or held upright, suspend a toy in front to encourage reaching.
Normal: 3-month-old shows reaching intent but cannot extend arm; 4-month-old extends arm but may not grasp toy; 5-month-old reaches and grasps toy.
Abnormal: 4-month-old shows no reaching intent; 5-month-old fails to reach for object.
Test Five: Rolling Over
Description: Place baby on back (in light clothing). Use a toy to encourage rolling toward one side.
Normal: 3-month-old shows rolling awareness and can roll to side; 4-month-old can roll from back to stomach.
Abnormal: No rolling awareness at 4 months; unable to roll to side-lying position at 5 months; unable to roll from back to stomach at 6 months.
Test 6: Interaction and Emotions
Explanation: Engage in face-to-face interaction with the baby and observe their responses.
Normal: At 2 months, baby may smile spontaneously and make soft gurgling sounds; at 3 months, can be made to laugh and vocalize;4-5 months: Shows interest in surroundings; 6 months: Recognizes familiar faces.
Abnormal: 3 months: Does not smile when coaxed face-to-face; 4 months: Does not vocalize; 5 months: Shows no interest in surroundings; 6 months: Appears emotionally detached, with no special reaction to caregivers.