The tonic neck reflex, also referred to as the asymmetric tonic neck reflex (ATNR) or the fencing reflex, plays a crucial role in a newborn’s early development. This reflex is a sign of how your baby’s brain and nervous system are maturing.
What is the Tonic Neck Reflex in Babies?
You might not always notice the tonic neck reflex because it can be quite subtle. When you lay your newborn on their back, they will turn their head to one side. In response, the arm and leg on that side extend, while the opposite arm bends at the elbow, curling the hand into a fist. This can give the impression that your baby is ready to engage in a sword fight, hence the name “fencing reflex.” If your baby turns their head to the other side, the same action occurs in reverse.
When Does the Tonic Neck Reflex Appear?
Typically, the tonic neck reflex emerges shortly after birth and can be observed up until around 6 months of age. As your baby grows and begins to master voluntary movements, this reflex will gradually fade away.
How Do You Test for the Tonic Neck Reflex?
To test for the tonic neck reflex, gently lay your baby on their back and observe their head movement. If they turn their head to one side and exhibit the characteristic extension and bending of limbs, the reflex is present.
When to Call the Doctor
While the tonic neck reflex is a normal part of infant development, it’s important to consult a pediatrician if you have concerns about your baby’s reflexes or overall development.
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In summary, the tonic neck reflex is an intriguing aspect of newborn development, demonstrating the early signs of coordination and neurological growth. Observing this reflex can be a delightful experience for parents as they witness their baby’s development.