The limbs and external genitalia in the foetus are well developed in

Options

A. `8^(th)` week of pregnancy
B. `16^(th)` week of pregnancy
C. `12^(th)` week of pregnancy
D. `24^(th)` week of pregnancy

Answer

To solve the question regarding when the limbs and external genitalia in the fetus are well developed, we can follow these steps:

### Step 1: Understand the Developmental Timeline
- The development of the fetus occurs in stages, with significant changes happening at different weeks of pregnancy.

### Step 2: Identify Key Milestones
- The heart begins to form around the 4th week of pregnancy.
- By the end of the second month (approximately 8 weeks), the limbs start to develop, but they are not fully formed.
- Major organ systems, including limbs and external genitalia, are typically well developed by the end of the first trimester.

### Step 3: Analyze the Options
- **8th week of pregnancy**: Limbs are developing but not fully formed.
- **12th week of pregnancy**: Major organ systems, including limbs and external genitalia, are well developed.
- **16th week of pregnancy**: Development continues but is not the initial stage of well-formed limbs and genitalia.
- **24th week of pregnancy**: Further development occurs, but the question asks for when they are well developed, which is earlier.

### Step 4: Conclusion
- The correct answer is **12th week of pregnancy**, as this is when the limbs and external genitalia are considered well developed.

### Final Answer
The limbs and external genitalia in the fetus are well developed in the **12th week of pregnancy**.

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