## Core Concept
The pincer grasp, also known as the pincer grip, is a fine motor skill that involves the opposition of the thumb and index finger to pick up small objects. This grasp is an essential milestone in the development of hand function and dexterity in infants.

## Why the Correct Answer is Right
The pincer grasp is typically attained by infants around 9 to 12 months of age. This skill is a significant achievement in fine motor development, as it allows infants to manipulate and explore their environment more effectively. The development of the pincer grasp involves the maturation of the nervous system, particularly the corticospinal tract, and the refinement of hand movements.

## Why Each Wrong Option is Incorrect
* **Option A:** 6 months - At 6 months, infants are beginning to develop their hand function, but they primarily use a raking grasp to pick up objects, not the pincer grasp.
* **Option B:** 7 months - Although infants at 7 months are improving their hand coordination, they have not yet achieved the precision needed for the pincer grasp.
* **Option D:** 18 months - By 18 months, children have usually mastered the pincer grasp and are refining other fine motor skills, making this option too late for the attainment of this skill.

## Clinical Pearl / High-Yield Fact
A key point to remember is that the pincer grasp is an important indicator of fine motor development in infants. Delays in achieving this milestone can be an early sign of developmental disorders or neurological issues. Pediatricians often assess the pincer grasp during routine developmental screenings.

## Correct Answer: C. 9-12 months.