# 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. The mother needs contraception now and will keep breastfeeding exclusively. She does not want a method she must remember every day, and she hopes to conceive again about a year from now, soon after she stops the method. She first asks about the 3-monthly injectable. Which recommendation fits her needs, and why?

> source: MyMerci (mymerci.kr)  
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> 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.

The mother needs contraception now and will keep breastfeeding exclusively. She does not want a method she must remember every day, and she hopes to conceive again about a year from now, soon after she stops the method. She first asks about the 3-monthly injectable. Which recommendation fits her needs, and why?

## 보기

1. Progestin-only pills, because they do not affect milk supply
2. The implant, because fertility returns soon after removal **✔ 정답**
3. The monthly combined injectable, because fertility returns quickly
4. The 3-monthly injectable, because it is safe while breastfeeding

**정답: 2**

## 해설

Three needs must be met at once: safety during breastfeeding, no daily action, and a quick return of fertility. The 3-monthly injectable (DMPA) is safe while breastfeeding, but fertility may take many months to return after the last injection. The monthly combined injectable contains estrogen, which is not recommended while breastfeeding before 6 months, and progestin-only pills must be taken daily; the implant meets all three needs.

## 심화 해설

Clinical reasoning for postpartum contraception

This mother has three simultaneous needs: a method that is safe during exclusive breastfeeding, one that does not require daily action, and one from which she can transition to a planned pregnancy about a year later with minimal delay. The etonogestrel implant satisfies all three, whereas each alternative fails at least one requirement.

The 3-monthly injectable (DMPA) is compatible with breastfeeding but is the least favorable choice here because ovulation may remain suppressed for many months after the last injection. Return to fertility after DMPA discontinuation is often delayed, which conflicts with her stated goal of conceiving soon after stopping the method. The monthly combined injectable contains estrogen, which is generally avoided before 6 months postpartum in breastfeeding women because of concerns about milk supply. Progestin-only pills are safe for lactation and have a rapid return to fertility, but they require daily adherence, which she explicitly wants to avoid.

The implant is a long-acting reversible contraceptive (LARC) that provides highly effective protection without any daily or monthly action, and because it is progestin-only, it does not interfere with breast milk production. When the implant is removed, the contraceptive effect clears quickly, allowing a return to fertility within a short time. This aligns with her plan to conceive approximately one year from now.

Key point! In postpartum contraceptive counseling, the decision should be individualized around three axes: breastfeeding compatibility, user burden, and reversibility. The implant is the only option in this list that meets all three.

| Method | Breastfeeding safety | User action required | Return to fertility |
| --- | --- | --- | --- |
| Implant | Safe (progestin-only) | None after insertion | Rapid after removal |
| 3-monthly injectable (DMPA) | Safe | Injection every 3 months | Often delayed by several months |
| Monthly combined injectable | Not recommended before 6 months postpartum | Injection every month | Usually rapid |
| Progestin-only pills | Safe | Daily pill | Rapid |

The evidence base reinforces this reasoning. Post-pregnancy contraception guidance emphasizes that most methods, including LARC, can be initiated safely in the postpartum period, but breastfeeding status modifies which methods are preferred [1][3]. Breastfeeding itself suppresses fertility, yet the return of ovulation is unpredictable, so contraception should not be delayed when pregnancy prevention is desired [2]. In addition, inconsistent postnatal contraceptive counseling is a recognized contributor to unintended pregnancy in the first postpartum year, underscoring the importance of matching method characteristics to the woman’s expressed preferences [4].

Watch out! Do not equate “safe while breastfeeding” with “best overall fit.” DMPA is safe during lactation, but its delayed return to fertility makes it a poor match for a woman who wants to conceive soon after discontinuation.References (research sources)

- [1]Post-pregnancy contraception.Research articleCooper M, Kallner HK. (2026) · DOI: 10.1530/raf-25-0180

- [2]Contraception after pregnancy.Research articleGlasier A, Bhattacharya S, Evers H, Gemzell-Danielsson K, Hardman S, Heikinheimo O (2019) · DOI: 10.1111/aogs.13627

- [3]U.S. Selected Practice Recommendations for Contraceptive Use, 2024.GuidelineCurtis KM, Nguyen AT, Tepper NK, Zapata LB, Snyder EM, Hatfield-Timajchy K, Kortsmit K, Cohen MA, Whiteman MK, Contributors. (2024) · DOI: 10.15585/mmwr.rr7303a1

- [4]From Birth to Unintended Pregnancy: Postnatal Contraception Failures in the First Postpartum Year.Research articleJaved M, Baloch FN, Verma V. (2026) · DOI: 10.7759/cureus.105523

## 임상 시나리오

Postpartum Contraception SelectionMatching method to breastfeeding, convenience, and fertility goals
For a breastfeeding mother who wants no daily action and plans pregnancy in about 1 year, the etonogestrel implant is the best fit. It is progestin-only, so it does not reduce milk supply, and it requires no daily or monthly effort.

Fertility returns quickly after implant removal, unlike DMPA, where ovulation may stay suppressed for many months after the last injection. The monthly combined injectable contains estrogen and is generally avoided before 6 months postpartum in breastfeeding women.

CautionDo not choose DMPA solely because it is breastfeeding-safe; its delayed return to fertility directly conflicts with a near-term pregnancy plan. Always confirm the patient's timeline for future conception before recommending a method.

## 핵심 개념

- **LARC** — Long-acting reversible contraceptive; includes implants and IUDs, requiring no daily or monthly user action
- **Etonogestrel implant** — Progestin-only subdermal implant; highly effective, lactation-safe, and fertility returns quickly after removal
- **DMPA** — Depot medroxyprogesterone acetate, a 3-monthly progestin-only injectable; return to fertility may be delayed for many months
- **Lactational amenorrhea** — Breastfeeding-induced suppression of ovulation; estrogen-containing methods may reduce milk supply before 6 months postpartum
- **Return to fertility** — Time from method discontinuation to resumption of ovulation and ability to conceive

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