by Amy Spangler
June 29, 2010

Not ready for another baby just yet? Breastfeeding mothers everywhere struggle to find a method of birth control that is most likely to prevent pregnancy and least likely to affect their milk supply. Although hormonal methods such as combined oral contraceptive pills, patches, and rings (products containing both estrogen and progesterone) are commonly used in the U.S., their early use by breastfeeding mothers has been discouraged—until now. The Centers for Disease Control and Prevention (CDC) as part of its Morbidity and Mortality Weekly Report (MMWR) has released new recommendations on the use of methods of birth control.

The CDC report is based on a similar report by the World Health Organization (WHO)—Medical Eligibility Criteria for Contraceptive Use (MEC)—first published in 1996 and now in its 4^th edition. With the help of a group of experts, the WHO document was adapted by the CDC for use in the U.S. But several of the revised recommendations are creating a stir in the breastfeeding community—specifically those related to the use of hormonal methods (contraceptives containing estrogen or progesterone) by breastfeeding mothers in the first days after birth.

Previously, breastfeeding mothers were told to wait six months before taking combined oral contraceptives (COC)—those containing both estrogen and progesterone; and six weeks before using progesterone-only methods, including progesterone-containing intrauterine devices (IUDs), DepoProvera (a shot containing progesterone), and progesterone-only pills (POP). The new CDC guidelines allow for the use of COC immediately after birth. But given that the risks associated with early use usually outweigh the advantages, breastfeeding mothers should be counseled to wait four weeks, at which time the advantages generally outweigh the risks. The guidelines also allow for the immediate use of hormonal contraceptives containing only progesterone, stating that the advantages of immediate use generally outweigh the theoretical or proven risks, and that by four weeks there is no discernible risk.

Dr. Jerry Calnen, president of the Academy of Breastfeeding Medicine, expressed concern that the new guidelines ignore basic facts about how breastfeeding works. “The data are limited,” says Calnen. “But for now, the state of the science suggests that early progesterone exposure undermines breastfeeding.”

Those, like Dr. Calnen, who oppose the revised recommendations, worry that early use of hormonal methods will reduce milk production and have a negative effect on breastfeeding rates—both exclusivity and duration. Those who support the new guidelines argue that early access to hormonal methods of birth control will prevent a greater number of unintended pregnancies.

Dr. Robert Hatcher, professor of obstetrics and gynecology at Emory University and author of Contraceptive Technology, and Dr. Miriam Labbok, professor of public health at the University of North Carolina, were among the 31 experts brought together by the CDC to review the scientific evidence and the proposed guidelines.

According to Dr. Labbok, “The CDC bases its decisions on published research. Admittedly, there is little research on immediate postpartum use of hormonal contraceptives during lactation because many institutional review boards (IRBs) and researchers feel such research would put lactation at risk.”

“Aside from anecdotal data there is no evidence to support the theory that early use of COC (those containing estrogen and progesterone) causes problems,” says Hatcher. “Use during the first four weeks is a no, but after four weeks, the benefits may exceed the risks.”

“Historically, I did not provide COC to breastfeeding mothers until they were no longer breastfeeding exclusively, recommending a progestin-only method instead,” added Hatcher. “But if a woman, despite my encouragement to use a progestin-only method insists on using a COC—due to cost, availability, or concerns over irregular bleeding—I would accommodate her request.”

With regard to the use of contraceptives containing only progesterone, Hatcher says, “Currently there is no scientific evidence to show that early use of progestin-only contraceptives interferes with milk production—only anecdotal reports. The recommendation could change as more evidence becomes available, but until then, science does not support delaying their use.”

“The problem with the argument for early use of progesterone-only contraceptives,” says Labbok, “is that the science also does not support the safety of early use. There are no good studies on the use of hormonal contraceptives during the first days after birth that show the short- and long-term effects in breastfeeding mothers and babies.  DepoProvera is commonly given to breastfeeding mothers before they leave the hospital, with little or no counseling as to the risks. That DepoProvera is most often given to low income, minority women, makes the ethics of this practice all the more concerning.”

“Clients should be counseled as to all available family planning options and the risks and benefits of each,” says Labbok. “Describing a contraceptive method as ‘generally acceptable’ in the absence of new data is in my opinion a leap of faith that good counseling will be a part of each encounter.”

Given the concerns surrounding hormonal methods and the proven effectiveness of intrauterine devices (IUDs) why don’t more women, breastfeeding and non-breastfeeding, opt for IUDs?

According to Hatcher, data coming out of the Choice project, a family planning program at Washington University in St. Louis, show a trend toward greater use of IUDs and other long-acting reversible contraceptives (LARC) including implants and shots (DepoProvera). More than 6,000 women have participated in the program so far. Nearly 70 percent have chosen either an IUD (the progestin-containing Mirena or the copper-containing ParaGard) or an implant (Implanon) compared to less than 5 percent of women nationwide.

How did this program achieve such high rates of LARC use? There are two reasons. First, the researchers recognized that cost is a deterrent to choosing an IUD or implant, so both devices are provided free of charge. Second, as a prerequisite for joining the study, participants must agree to change their current method of birth control. Researchers have found that when women are told the many benefits of LARC—cost-effective, convenient, less bleeding and pain with monthly periods, less risk for anemia, less risk for endometrial cancer, and less blood loss and pain caused by endometriosis and uterine fibroids—many will choose an IUD or implant.

In addition to concerns over early use of hormonal contraceptives, Labbok points out that the new CDC guidance has no data showing the effectiveness of breastfeeding (exclusively or almost exclusively) in family planning. “Birth spacing is very important for maternal health, but so is breastfeeding. While there are many contraceptive options that can be considered instead of hormonal contraceptives, there is no effective alternative to breastfeeding given its impact on maternal and child health,” says Labbok.

Many would agree that breastfeeding can and should be an integral part of any family planning program. Exclusive breastfeeding is one of the most common strategies for spacing births worldwide, providing protection comparable to to that of birth control pills. Commonly referred to as the lactation amenorrhea method (LAM), exclusive or almost exclusive breastfeeding is a highly effective method, albeit a temporary one. Suckling is the key ingredient. The more time a baby spends suckling at the breast, the less risk the mother has of becoming fertile. As the baby’s suckling time goes down due to the use of pacifiers, supplements, solid foods, or long stretches of sleep, the mother’s risk for ovulation (the release of an egg from her ovary) goes up, along with her risk for pregnancy. For LAM to be effective three criteria must be met:

• Mothers must not have resumed menstrual periods;
• Babies must be fully or nearly fully breastfed day and night; and
• Babies must be less than 6 months old.

According to Labbok, “LAM has been shown to be effective for 9 to 12 months in mothers who have maintained a high frequency of feeds and who breastfeed before each complementary feed.”

While the effectiveness of LAM is well-documented, if any of the criteria are not met, another method of contraception should be used.

Birth control pills along with female sterilization are the leading methods of birth control in the U.S. A recent survey by the National Center for Health Statistics found that during 2006-2008 an estimated 10.7 million women ages 15 to 44 used the pill and another 10.3 million chose to be sterilized. Despite these figures, half of all pregnancies in the U.S. are unintended, highlighting the need for greater use of long-acting reversible contraceptives including IUDs, implants, and shots.

Even among breastfeeding mothers, contraceptive needs vary. Talk with your health care provider about the birth control method that is best for you with consideration given to cost, convenience, availability, and effectiveness. Learning all that you can about the benefits and the risks of various options will allow you to make an informed decision based on a clear understanding of the facts.  For more information about contraception visit Managing Contraception.

“Personally, I believe contraceptives should be treated like immunizations and be made available to everyone regardless of their ability to pay,” says Hatcher, and Labbok agrees, adding the need for proper counseling. This is sage advice, given the public health implications of immunizations, contraceptives, and breastfeeding.