**Core Concept**

Puerperal sepsis is a severe and potentially life-threatening infection that can develop in women during the postpartum period, typically within 6 weeks after childbirth. It occurs due to the invasion of microorganisms into the uterus, leading to inflammation and systemic infection. The correct answer represents the time frame within which puerperal sepsis can develop.

**Why the Correct Answer is Right**

Puerperal sepsis is a clinical condition resulting from the invasion of microorganisms into the uterus, leading to inflammation and systemic infection. In this case, the correct answer refers to the time frame within which puerperal sepsis can develop. This is important for healthcare professionals to recognize and promptly treat the condition to prevent complications and improve outcomes for the mother and the newborn.

**Why Each Wrong Option is Incorrect**

A. **Option A (42 days):** This is incorrect because puerperal sepsis typically develops within the first 6 weeks following childbirth. Infections occurring after this period are considered postpartum endometritis, which is a different clinical entity.

B. **Option B (3 months):** This is also incorrect as puerperal sepsis is more likely to develop within the first 6 weeks postpartum. Postpartum endometritis, on the other hand, occurs later, up to 3 months postpartum.

C. **Option C (6 weeks):** Although the correct answer indicates a time frame of up to 6 weeks, options A and B are also incorrect due to the timeframes they represent.

D. **Option D (90 days):** This is incorrect as puerperal sepsis typically occurs within the first 6 weeks after childbirth. Postpartum endometritis, which may develop later, is distinguished from puerperal sepsis.

**Clinical Pearl / High-Yield Fact**

Recognizing the time frame of puerperal sepsis is essential for healthcare professionals to promptly diagnose and treat the condition. Early detection and management can help prevent complications and improve maternal and neonatal outcomes. It is crucial to differentiate between puerperal sepsis and postpartum endometritis to ensure appropriate management strategies are employed.

**Correct Answer: Option C (6 weeks)**

In summary, puerperal sepsis can occur up to 6 weeks postpartum, which is within the first 42 days (6 weeks) following childbirth. This knowledge is crucial for healthcare professionals to accurately diagnose and manage the condition, ensuring optimal maternal and neonatal outcomes.