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Comprehensive and Detailed Explanation:

Lactogenesis II refers to the onset of copious milk production that typically occurs within several days after childbirth. This process is triggered primarily by the rapid decline in progesterone levels following placental delivery while prolactin levels remain elevated.

Mothers often describe this phase as their milk "coming in." Common signs include breast fullness, increased milk volume, and noticeable changes in infant feeding behavior. Effective milk removal during this period is essential for establishing long-term milk production.

Prolactin secretion continues throughout lactation and remains important for milk synthesis. Oxytocin activity also remains essential because it supports milk ejection. Milk supply continues to adjust according to infant demand rather than becoming permanently fixed. Understanding Lactogenesis II is critical for recognizing normal lactation patterns and identifying delays requiring further assessment.