**Core Concept**
The bidextrous approach, also known as the bilateral approach, is a fundamental concept in pediatric neurology that refers to the age at which a child begins to use both hands in a coordinated manner for various activities. This developmental milestone is essential for assessing normal motor development and identifying potential neurodevelopmental disorders.

**Why the Correct Answer is Right**
The bidextrous approach typically emerges between 12 to 18 months of age, as the child's brain undergoes significant maturation and synaptic plasticity. This age range corresponds to the transition from a predominantly unilateral to a bilateral pattern of motor activity, reflecting the development of integrated hemispheric control and corticospinal tract maturation. As the child begins to use both hands in a coordinated manner, they demonstrate improved fine motor skills, hand-eye coordination, and overall motor dexterity.

**Why Each Wrong Option is Incorrect**
**Option A:** 6 months - This age is too early for the bidextrous approach, as most infants at this stage exhibit a predominantly unilateral pattern of motor activity.

**Option B:** 24 months - This age is too late, as most children have already established a bilateral pattern of motor activity by 18-24 months, with some children showing bidexterity as early as 12 months.

**Option C:** 36 months - This age is significantly later than the typical age range for the bidextrous approach, as most children have already developed advanced fine motor skills and hand-eye coordination by 3 years of age.

**Clinical Pearl / High-Yield Fact**
A key clinical correlation is that children with neurodevelopmental disorders, such as cerebral palsy or autism spectrum disorder, may exhibit delays or abnormalities in the development of the bidextrous approach. Therefore, assessing this milestone is essential for early identification and intervention in these conditions.

**Correct Answer: C. 18 months**