Tankeyoon and colleagues examined the effect of hormonal contraceptives on breast milk volume using a standardized pump-expression technique.7 At 24 weeks after delivery, the volume of breast milk expressed with a breast pump in lactating women was (by method of contraception studied):
- estrogen–progestin pill: 41 mL
- progestin mini-pill (0.075 mg norgestrel): 65 mL
- depot medroxyprogesterone acetate (DMPA): 65 mL
- controls (intrauterine contraceptive, barrier method, sterilization, or no contraceptive): 59 mL.
These results show that the estrogen–progestin contraceptive reduced breast milk volume by 31%, whereas the progestin-only method increased breast milk volume by 10%.
The physical and cognitive development of breast-fed infants does not appear to be harmed if their mother uses an estrogen–progestin contraceptive. Nevertheless, most experts recommend avoiding such combination agents during the first 42 days after delivery.
Widely available progestin-only contraceptives include:
- etonogestrel progestin implant (Implanon)
- DMPA injection (Depo-Provera)
- progestin-only oral norethindrone, 0.35 mg/d (e.g., Micronor, Nor QD, Camila, Errin, Heather)
The progestin-only mini-pill, norgestrel, 0.075 mg/d, is no longer available in the United States.
Guidance for offering progestin-only methods. For women who are not breastfeeding, a progestin-only contraceptive can be started immediately after delivery. Experts are at odds, however, over the optimal timing of initiation of progestin-only contraception for women who are breastfeeding.
FDA patient information about DMPA advises women to delay the first injection until 6 weeks after delivery. The FDA recommends that breastfeeding women delay initiating progestin-only pills until 6 weeks postpartum. In a setting of “partial breastfeeding”—a woman who combines breastfeeding with formula feeding—the FDA recommends initiating a progestin-only pill 3 weeks after delivery.
The manufacturer of the progestin implant recommends inserting the device 4 weeks after delivery; FDA labeling states only that the use of Implanon in breastfeeding women fewer than 28 days after delivery has not been studied.
Because progestin-only agents have little effect on the risk of DVT and on breast milk production, however, many experts in clinical medicine are comfortable recommending that a progestin-only agent can be initiated immediately after delivery in breastfeeding women.8 In fact, the CDC supports the use of progestin-only contraceptives immediately postpartum.9
The progestin implant or DMPA can be initiated during the patient’s postpartum stay. Doing so provides reliable contraceptive coverage through to the first prenatal visit.
Last, in a small randomized trial that compared insertion of Implanon 24 to 48 hours after delivery with injection of DMPA 6 weeks after delivery, women who were given the implant had lost more weight and had a higher serum HDL-cholesterol level, on average, than women who had an injection of DMPA at a 12-week follow-up visit.10
OPTION: Barriers and permanent methods
Barrier contraceptives. A woman can have her partner use a condom safely and effectively at any time postpartum. Given that some couples experience a reduction in coital frequency after the birth of their child, the condom is an excellent option: It bridges the interval from birth to the 6-week visit without any impact on breast milk production or the risk of deep venous thrombosis.
Use of a diaphragm, or cervical cap, should be delayed until 6 weeks postpartum, to allow any pregnancy-related changes to the vagina, cervix, and uterus to resolve.
Sterilization. Postpartum sterilization is best performed within 24 hours after delivery or as an interval procedure.
For immediate postpartum sterilization, two of the most common procedures are the modified Pomeroy tubal ligation and placement of a Filshie clip.
For interval sterilization, two common procedures are Adiana and Essure hysteroscopic tubal occlusion.
To recap: Counsel, encourage, choose, use
Women have many safe and effective postpartum contraceptive options. The optimal course is for a patient to decide on a postpartum contraceptive during her prenatal care, after you’ve discussed the risks and benefits of her options.
As I discussed, contraceptives that can be initiated immediately after delivery include:
- post-placental placement of an intrauterine device
- progestin-only method
- condom
- sterilization.
The reliability of long-acting reversible contraceptives, including the progestin implant and the LNG-IUS, make these two methods especially useful for preventing pregnancy in women who have difficulty using a daily pill or a barrier contraceptive.
For postpartum women who are in greatest need of contraception because they lack easy access to care, your goal should be encourage them to use a long-acting, reversible contraceptive such as the copper IUD, progestin-releasing IUS, progestin implant, or DMPA.
Key guidance for responding to this patient
In the scenario on page 8, your postpartum patient first asked if she could start an oral contraceptive immediately. What should you have told her?
“No.” The CDC does not recommend that a woman start an estrogen–progestin contraception immediately after delivery because of 1) the impact this dual formulation has on breast milk volume and quality and 2) the increased risk of deep venous thrombosis it creates in the postpartum period.
Your patient also asked if you could place a copper intrauterine device before she was discharged. Again, what should you have told her?
“No.” Most experts believe that an intrauterine contraceptive must be placed either 1) within the first 10 minutes after delivery of the placenta or 2) at an interval visit, such as a postpartum visit. The risk of expulsion of an IUD is thought to be higher when it has been placed between 10 minutes and 48 hours after delivery than immediately post-placentally.