IBCLC Practice Exam 2025 – Complete Preparation Guide

Lactogenesis I, the first stage of milk production that occurs during late pregnancy, is primarily governed by endocrine control mechanisms. During this phase, hormonal influences play a crucial role in initiating the development of the mammary glands and preparing them for milk production. The key hormones involved include prolactin, which promotes the growth of mammary tissue and the initiation of milk synthesis, alongside other hormones such as estrogen and progesterone that create a conducive environment for these physiological changes.

Endocrine control mechanisms involve hormones being released into the bloodstream and acting on target organs, like the mammary glands, thereby regulating their function. This is distinct from other control mechanisms such as autocrine, which involves hormones acting on the same cells that produce them, or neural control, which relies on nerve impulses to trigger responses. In the case of lactogenesis I, the systemic response of hormones allows for the necessary changes in the breast tissue to occur in preparation for lactation.

Recognizing the dominant role of endocrine mechanisms in lactogenesis I is vital for understanding how milk production is initiated and how various factors, including hormonal levels, can impact this process during the late stages of pregnancy. This understanding forms a foundational element for IBCLC practice, where supportive measures can be tailored to