## **Core Concept**
The Moro reflex, also known as the startle reflex, is a normal reflex found in newborns. It is characterized by a specific response to a perceived threat, where the infant spreads out their arms, then brings them back in, as if embracing. This reflex is an important indicator of neurological integrity in the neonatal period.

## **Why the Correct Answer is Right**
The Moro reflex typically disappears by 4 to 6 months of age as the infant's nervous system matures. Persistence of the Moro reflex beyond this age can indicate a neurological abnormality or developmental delay. The reflex's disappearance is a sign of normal brain development, particularly of the pyramidal tracts.

## **Why Each Wrong Option is Incorrect**
- **Option A:** 2 months - This is too early for the Moro reflex to persist; it usually starts to fade around this time.
- **Option B:** 4 months - This is the age by which the Moro reflex should start to disappear; persistence beyond this could be considered abnormal.
- **Option D:** 8 months - While persistence beyond 6 months is definitely abnormal, specifying 8 months as the cutoff is less precise than option C.

## **Clinical Pearl / High-Yield Fact**
A key clinical point to remember is that the Moro reflex should disappear by 4-6 months. Persistence beyond 6 months can be a sign of neurological issues, such as cerebral palsy or developmental delay. Clinicians often test for the presence and duration of this reflex during routine infant check-ups.

## **Correct Answer:** C. 6 months.