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Primitive Reflexes
Primitive Reflexes In Infancy
Reflex | Description | Age Reflex Disappears |
---|---|---|
Root | When infant's cheek is stroked, the infant turns to that side, searching with mouth. | 3 Months |
Suck | Reflexive sucking when nipple or finger is placed inside infant's mouth. | 2-5 Months |
Moro | With sudden extension of the head, the arms abduct and move upward and the hands form a "C." | 4 Months |
Asymmetric Tonic Neck | While laying supine, extremities are extended on the side of the body to which the head is turned and the opposite extremities are flexed (a.k.a. "fencing" position). | 4 Months |
Palmer Grasp | Infant reflexively grasps when palm is touched. | 4-6 Months |
Plantar Grasp | Infant reflexively grasps with bottom of foot when pressure is applied to plantar surface. | 9 Months |
Babinski | Stroking along the lateral aspect of the sole and across the plantar surface results in fanning and hyper-extension of toes. | 12 Months |
Step | With one foot on a flat surface, the infant puts the other foot down as if to "step." | 4-8 Weeks |