When the nurse examines an 8-month-old who is developing properly, the newborn has an asymmetric tonic neck reaction, also known as a fencing reflex.
Put your infant on their back and swivel their head to the right to test the fencing reflex. When the head is twisted in the opposite direction from the reflex, the left arm (on the opposite side) flexes alongside the head while the right arm extends straight. This reflex should be present at birth.
The infant reacts by flexing the arm and leg on the opposite side and extending the arm and leg on that side. The "fencer's position" refers to how the arm and leg are held. A flaccid disorder or hypotonicity may be present if the reflex is absent.
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