**Core Concept**
The developmental examination of a child involves assessing various milestones of growth and development, including gross and fine motor skills, language, and social-emotional development. In infants, developmental milestones are typically assessed at regular intervals, and any delay or concerns warrant further evaluation.

**Why the Correct Answer is Right**
A child of 12 weeks should be evaluated further if there are concerns regarding developmental delays, particularly in gross motor skills such as sitting, crawling, or standing. Around 12 weeks, infants typically start to sit up with support and may begin to reach for toys. Delays in these milestones can indicate underlying neurological or developmental issues.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided, so we cannot evaluate it.
**Option B:** This option is not provided, so we cannot evaluate it.
**Option C:** This option is not provided, so we cannot evaluate it.
**Option D:** This option is not provided, so we cannot evaluate it.

**Clinical Pearl / High-Yield Fact**
The Denver Developmental Screening Test (DDST) and the Bayley Scales of Infant Development (BSID) are two commonly used tools for assessing developmental milestones in infants. These tools help identify potential delays or concerns that may require further evaluation.

**Correct Answer:** None provided in the options