A 40 weeks old infant can do all the following except?
**Core Concept**
The question assesses the developmental milestones of an infant, specifically the physical and cognitive abilities expected at 40 weeks of age. The correct answer requires knowledge of the typical gross motor and fine motor skills, language, and cognitive development milestones in infants.
**Why the Correct Answer is Right**
At 40 weeks, infants typically have achieved certain milestones such as sitting up without support, crawling, standing with support, and saying a few words like "mama" or "dada." However, the ability to walk independently is usually not mastered until around 12-14 months of age, which is beyond the expected developmental stage of a 40-week-old infant.
**Why Each Wrong Option is Incorrect**
* **Option A:** Sitting up without support is typically achieved by 6-7 months of age, so this option is not the correct answer.
* **Option B:** Crawling is usually mastered by 7-10 months of age, making it an incorrect option.
* **Option C:** Standing with support is typically achieved by 9-12 months of age, making it an incorrect option.
**Clinical Pearl / High-Yield Fact**
It is essential for healthcare providers to be aware of the normal developmental milestones in infants to identify potential developmental delays or disorders.
**Correct Answer:** D. Walking independently.