# Situation: A 29-year-old mother is 3 months postpartum and gives her baby only breast milk. She returns to her office job next week, where she works 8 hours a day, and she visits the health center for counseling before going back to work. While practicing, the mother has stored some expressed milk and shows the nurse her log. Batch | How it was stored 1 | At room temperature, expressed 2 hours ago 2 | In the refrigerator, expressed 12 hours ago 3 | Fully thawed in the refrigerator 30 hours ago, still cold 4 | In a separate-door freezer, expressed 3 weeks ago Based on breast milk storage guidelines, which milk should she discard?

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=629488  
> language: ko  
> subject: Nursing Practice II — Maternal and Child Health Nursing

## 문제

Situation: A 29-year-old mother is 3 months postpartum and gives her baby only breast milk. She returns to her office job next week, where she works 8 hours a day, and she visits the health center for counseling before going back to work.

While practicing, the mother has stored some expressed milk and shows the nurse her log.

Batch | How it was stored
1 | At room temperature, expressed 2 hours ago
2 | In the refrigerator, expressed 12 hours ago
3 | Fully thawed in the refrigerator 30 hours ago, still cold
4 | In a separate-door freezer, expressed 3 weeks ago

Based on breast milk storage guidelines, which milk should she discard?

## 보기

1. The milk thawed 30 hours ago **✔ 정답**
2. The milk refrigerated for 12 hours
3. The milk at room temperature for 2 hours
4. The milk frozen for 3 weeks

**정답: 1**

## 해설

Storage limits for fresh and frozen milk vary slightly among guidelines, and the room-temperature, refrigerated, and frozen batches are within all of them. Thawed milk must be used within 24 hours and never refrozen, so the batch thawed 30 hours ago must be discarded.

## 심화 해설

The batch to discard
Breast milk storage guidelines differ slightly in their exact limits for fresh and frozen milk, but they agree on one firm rule for thawed milk: once frozen milk has been fully thawed in the refrigerator, it must be used within 24 hours and must never be refrozen. Batch 3 was thawed 30 hours ago. Even though it is still cold, it has passed the 24-hour limit. The milk thawed 30 hours ago should be discarded.

Why thawed milk has a shorter life
Freezing preserves milk but changes it: some protective components are reduced and the fat separates. Once it thaws, bacteria that survived freezing can begin to multiply again, and the milk's own antibacterial properties are weaker than in fresh milk. That is why thawed milk has a shorter safe period than freshly expressed refrigerated milk, and why refreezing is not allowed.

Checking the other batches
The remaining batches fall within every common guideline.

| Batch | Storage | Status |
| --- | --- | --- |
| 1 | Room temperature, expressed 2 hours ago | Within limits; use soon |
| 2 | Refrigerator, expressed 12 hours ago | Within limits |
| 3 | Thawed in refrigerator 30 hours ago | Discard: past the 24-hour thawed limit |
| 4 | Separate-door freezer, expressed 3 weeks ago | Within limits |

Watch out! The room-temperature milk may look like the riskiest choice because it is not chilled, but freshly expressed milk is safe at room temperature for a few hours, and 2 hours is within every common guideline. The key is to know which rule is the strictest and applies without exception. Milk left over from a feed the baby has started should also be discarded rather than saved.

Teaching the mother
The nurse teaches the mother to label each container with the date and time of expression, to use the oldest milk first, to thaw milk in the refrigerator or in a container of warm water rather than in a microwave, and to swirl the milk gently to mix the separated fat. She stores milk at the back of the refrigerator or freezer, where the temperature is most stable, and keeps a log as this mother has done.

Exam takeaway
Thawed breast milk is used within 24 hours and never refrozen. Key point! When storage guidelines vary, look for the option that breaks a rule shared by all guidelines.

## 임상 시나리오

Breast Milk Storage CheckReviewing a mother's storage log
Freshly expressed milk at room temperature for 2 hours, refrigerated for 12 hours, or frozen for 3 weeks in a separate-door freezer is within common guidelines.

Milk fully thawed in the refrigerator must be used within 24 hours and never refrozen.

Label containers with date and time, use the oldest first, and thaw in the refrigerator or warm water, not a microwave.

CautionDiscard thawed milk kept longer than 24 hours, even if it is still cold.

## 핵심 개념

- **Thawed breast milk** — Previously frozen milk that has fully melted; it is used within 24 hours and never refrozen.
- **Separate-door freezer** — A freezer with its own door, which keeps a steadier, colder temperature than a freezer compartment.
- **Breast milk storage guidelines** — Recommended time limits for keeping expressed milk at room temperature, refrigerated, frozen, or thawed.
- **First in, first out** — Using the oldest stored milk first so none passes its safe storage time.

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