After delivering the full-term infant, the breastfeeding mother asks the nurse if there is any contraceptive method that she should avoid while she is breastfeeding. Which contraceptive should the nurse advise the client to avoid?

Because a diaphragm must be fitted to the individual female cervix, the diaphragm must be rechecked for correct size after each childbirth; however, use of the diaphragm will not affect breast milk production. An IUD will not affect breast milk production unless the IUD is inserted within the first 48 hours postpartum; insertion should be delayed until 4 weeks postpartum. Birth control pills containing progesterone and estrogen (COC) can cause a decrease in milk volume and may affect the quality of the breast milk. The progesterone-only mini pill may be used by breastfeeding clients because it does not interfere with breast milk production. However, it is recommended that the mother wait 6 to 8 weeks before starting this method of contraception.