When does the asymmetric tonic neck reflex typically disappear?

• A. 4 months
• B. 6 months
• C. 8 months
• D. 10 months

Answer: (B)

The asymmetric tonic neck reflex, often referred to as the "fencing reflex," is a primitive reflex seen in infants. It typically emerges around birth and is characterized by the infant turning their head to one side, which causes the arm on that same side to extend while the opposite arm bends. This reflex plays a role in the early development of hand-eye coordination and is often observed during the first few months of life.

The timing for the disappearance of this reflex is usually around 6 months of age. By this age, infants have typically developed greater motor control and coordination, making the reflex less prominent as they begin to engage in more voluntary movements. The resolution of this reflex is an important milestone, indicating that the child's neurological development is progressing as expected. If the reflex persists beyond this age, it may suggest a delay in neurodevelopment.

Understanding the typical timeline for reflexes assists caregivers and healthcare providers in monitoring infant growth and development, helping to identify any potential concerns early on.