What is a major reason for restricting breastfeeding as a contraceptive method?

The use of breastfeeding as a contraceptive method, often referred to as the Lactational Amenorrhea Method (LAM), has its limitations, primarily due to the hormonal implications associated with estrogen. Breastfeeding can suppress ovulation due to elevated levels of prolactin; however, the introduction of estrogen—often found in some contraceptives—can interfere with this natural suppression. Therefore, introducing estrogen can diminish the effectiveness of breastfeeding as a contraceptive method, as it may allow ovulation to resume earlier than anticipated. This is especially important when considering the timing of initiating supplemental feeding or introducing hormonal birth control options.

While the other choices have relevance in discussions about breastfeeding, they do not directly address the core issue of hormonal impact in the context of using breastfeeding as a contraception. Hormonal fluctuations may occur naturally, but they do not emphasize the specific concern with the presence of estrogen. Dehydration risk pertains more to the mother's health than contraception, and growth concerns primarily involve the infant's health rather than the effectiveness of breastfeeding as a contraceptive method.