What is a restriction on breastfeeding related to contraceptive methods?

The correct answer focuses on the recommendation that breastfeeding mothers should avoid contraceptive methods that contain estrogen, particularly within the first six weeks postpartum. This is due to the potential for estrogen to reduce milk supply and impact breastfeeding effectiveness. Progestin-only contraceptives are often recommended for breastfeeding women because they are less likely to affect milk production while still providing effective birth control. In the context of breastfeeding, the timing and hormonal composition of contraceptives are crucial to ensure that the mother's ability to breastfeed is not compromised.

The other options do not accurately reflect guidelines concerning contraception during breastfeeding. The mention of combined methods or specific feeding practices does not address the hormonal considerations that directly affect breastfeeding, which is why focusing specifically on non-estrogen-based contraceptives is essential for nursing mothers.