## **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 loss of support or sudden movement, where the infant spreads out their arms, then brings them back in as if embracing. This reflex is an important indicator of the neurological development of infants.

## **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. This reflex is most prominent in the first month and gradually diminishes as voluntary movements and more complex neurological functions develop. By around 6 months, infants start to exhibit more controlled reactions to their environment, indicating the integration of this reflex.

## **Why Each Wrong Option is Incorrect**
- **Option A:** 2 months is too early for the Moro reflex to disappear. While it may start to diminish, it is generally still present.
- **Option B:** 4 months could be considered a bit early, as the reflex usually disappears around this time but can persist slightly longer.
- **Option D:** 12 months is much too late for the Moro reflex to disappear. By this age, infants have developed significant voluntary control over their movements and more complex neurological functions.

## **Clinical Pearl / High-Yield Fact**
A key clinical point to remember is that the persistence of the Moro reflex beyond 6 months can be an indicator of neurological issues. Clinicians often assess the presence and timing of reflex disappearance as part of a neurological examination in infants.

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