Neurologic Exam-Pediatric | 6-month-old | Normal | Postural Reflexes - Positive Support Reflex

6-month-old - Normal 11 - Postural Reflexes - Positive Support Reflex: Some consider the positive support reflex as a primitive reflex, but others consider it a postural reflex. I think it is a postural reflex because it is necessary for erect posture and blends into volitional standing. Infants with prenatal or perinatal corticospinal tract disease will often refuse to support their weight on their feet. The positive support reflex is the first postural reflex to develop and is present by 3 to 4 months of age. When the baby is placed in vertical suspension with the feet touching the mat, the baby will extend the legs and attempts to support his weight while being balanced by the examiner. By 5 to 6 months of age the baby fully supports his weight while standing and by 7 months enjoys bouncing.