Neurologic Exam-Pediatric | 3-month-old | Normal | Positions - Supine

3-month-old - Normal 07 - Positions - Supine: In the supine position, the baby's extremities are held off the mat and there is spontaneous movement of all extremities. During the first 3 months of life, babies will often lie with their head turned to one side or the other. This may be associated with extension of the arm that the head is turned towards. This is part of the asymmetric tonic neck reflex, which is most prominent during this time but diminishes by 3 to 4 months of age and is gone by 6 months of age.