During which stage does copious milk secretion occur?

The stage during which copious milk secretion occurs is Lactogenesis II. This phase typically begins around 2 to 4 days after childbirth, marking a significant transition from the synthesis of small amounts of colostrum to the production of mature milk. During Lactogenesis II, hormonal changes, including a decrease in progesterone and an increase in prolactin levels, stimulate the milk-producing cells in the breast. As a result, the volume of milk produced increases substantially, making it available for the newborn.

Lactogenesis I occurs during late pregnancy and leads to the production of colostrum. While important for the initial stages of breastfeeding, it does not involve the copious secretion characteristic of Lactogenesis II. Lactogenesis III occurs after the initial abundant milk supply has stabilized, typically around two weeks postpartum, focusing on the maintenance of milk production based on supply and demand. Thus, the correct choice reflects the phase critical for initiating a robust breastfeeding experience.