## **Core Concept**
The fixation reflex of the eyes is a critical developmental milestone that enables infants to focus on objects and track their movement. This reflex is essential for visual development and maturation. The development of fixation reflexes is closely related to the maturation of the visual pathway and the extraocular muscles.

## **Why the Correct Answer is Right**
The fixation reflex, also known as the fixation and following reflex, typically develops around 1-2 months of age. This reflex allows infants to fixate on an object and follow it as it moves. The development of this reflex is an indicator of normal visual and neurological development. It is mediated by the **visual cortex** and the **extraocular muscles**, which work together to enable the eyes to focus and move appropriately.

## **Why Each Wrong Option is Incorrect**
* **Option A:** Fixation reflexes do not develop immediately at birth; hence, stating they develop at birth is incorrect.
* **Option B:** While significant visual development occurs by 2-3 months, stating fixation reflexes develop at 3 months might be a bit late, as they start to emerge earlier.
* **Option D:** Saying fixation reflexes develop at 6 months is too late, as they are expected to start developing much earlier.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that the absence or delay in the development of fixation reflexes can be an early indicator of **visual impairment** or **neurological issues**. Clinicians often test for this reflex during routine infant examinations.

## **Correct Answer:** . 1–2 months.