## **Core Concept**
Postpartum blues, also known as baby blues, is a condition that affects many women after childbirth. It is characterized by feelings of sadness, anxiety, and emotional instability. The condition is believed to be related to the significant hormonal changes that occur after delivery.

## **Why the Correct Answer is Right**
The correct timeframe for postpartum blues is within the first few days after delivery, typically peaking around the third to fifth day postpartum. This timing coincides with the physiological changes and hormonal fluctuations, particularly the drop in estrogen and progesterone levels, which are thought to contribute to the condition.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because postpartum blues typically do not occur immediately at the time of delivery but rather a few days later.
- **Option B:** This option suggests a timeframe that is too long for typical postpartum blues, which usually resolve within a week.
- **Option C:** This option suggests a broad timeframe but is less specific than option D and does not accurately reflect the typical onset and duration of postpartum blues.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that postpartum blues are very common, affecting up to 80% of new mothers, and usually resolve on their own within a week or two without treatment. However, it's crucial to distinguish postpartum blues from more severe conditions like postpartum depression, which requires medical intervention.

## **Correct Answer:** D. 3-5 days.