**Core Concept**
Developmental examination is crucial in pediatric care, focusing on assessing growth and development milestones in children. This question pertains to the evaluation of developmental delay in infants, particularly the significance of the 12-week assessment.

**Why the Correct Answer is Right**
The 12-week examination is a critical milestone in assessing developmental delay, as it corresponds with the 40th percentile in the Bayley Scales of Infant Development. At this stage, infants typically exhibit distinct developmental milestones, such as holding their head steady while sitting, making cooing sounds, and responding to sounds. The primary focus of this evaluation is to identify any signs of developmental delay or potential neurodevelopmental disorders.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not provided.
* **Option B:** This option is not provided.
* **Option C:** This option is not provided.
* **Option D:** This option is not provided.

**Clinical Pearl / High-Yield Fact**
The 12-week developmental examination is a critical milestone in pediatric care, and any signs of developmental delay should prompt further evaluation and referral to a specialist for timely intervention.

**Correct Answer:** Not provided.