A reflex is an involuntary muscular reaction to a certain type of stimulation. Certain sensations or movements produce specific muscle responses, such as the case of tonic neck reflex in babies. It is a normal childhood reflex in babies up to six months.
The tonic neck reflex occurs when the head of a child relaxed in a supine position is rotated to the side. Babies up to six or seven months, when turning their head to the side, stretch the arm on that side that looks at the head and the other arm is flexed by the elbow, adopting a position of defense, what pediatricians call " fencing position ”.
The arm on the side to which the child is looking is extended with the hand partially open, while the arm on the opposite side is flexed and the fist is clenched tightly. By reversing the turn of the child's face, tonic neck reflex It continues to occur, reversing the position.
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