**Core Concept**
Bidextrous grasp, also known as simultaneous bilateral grasp, is a developmental milestone in infants where they demonstrate the ability to grasp objects with both hands simultaneously. This skill is an essential precursor to more complex hand functions and is an indicator of normal neurological development.

**Why the Correct Answer is Right**
The bidextrous grasp typically appears between 4-6 months of age as infants begin to develop the coordination and motor control necessary for complex hand movements. This is a result of the maturation of the corticospinal tracts and the development of the primary motor cortex, which enables the integration of bilateral hand movements. The appearance of bidextrous grasp is often accompanied by other developmental milestones, such as the ability to raking and grasping with the fingers.

**Why Each Wrong Option is Incorrect**
**Option A:** 2 months - This is too early for the development of bidextrous grasp, as infants at this age are still refining their basic hand movements and are not yet able to coordinate bilateral hand actions.

**Option B:** 8 months - This is too late, as most infants have already developed the ability to grasp objects with both hands by this age. The bidextrous grasp is a relatively early milestone in infant development.

**Option C:** 10 months - This is also too late, as the bidextrous grasp is typically established before this age.

**Clinical Pearl / High-Yield Fact**
A normal bidextrous grasp is an important indicator of normal neurological development, and its absence or delay may be a red flag for potential developmental disorders, such as cerebral palsy or other neurodevelopmental disorders.

**Correct Answer: C. 6 months**