To assess the tonic neck reflex of a 3-month-old infant in a supine position,you rotate the infant's head to the right side and hold the jaw parallel to the shoulder.A normal response is for the infant to

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Place the infant in a supine position on the exam table.Rotate the head to one side and hold the jaw parallel to the shoulder.The upper and lower extremities on the side to which the jaw is turned extend,and the opposite arm and leg flex.Sometimes,this reflex does not show up until 6 to 8 weeks of age.After 6 months of age,the tonic neck reflex is abnormal.

To Assess the Tonic Neck Reflex of a 3-Month-Old Infant