What is the primary hormone responsible for milk ejection during breastfeeding?

The primary hormone responsible for milk ejection during breastfeeding is oxytocin. This hormone plays a crucial role in the breastfeeding process by triggering the myoepithelial cells around the milk-producing alveoli in the breast to contract. This contraction helps to push the milk through the ducts and out of the nipple, making it available to the breastfeeding infant.

Oxytocin is released in response to the baby’s suckling and helps create a feedback loop that encourages continued breastfeeding. The surge of oxytocin during breastfeeding not only aids in milk ejection but also promotes bonding between the mother and the infant, which is essential for successful breastfeeding.

While progesterone and estrogen are important hormones in breast development and preparation for lactation during pregnancy, they do not directly facilitate the ejection of milk. Prolactin is primarily responsible for milk production rather than ejection. Understanding the distinct roles these hormones play can enhance the comprehension of the lactation process.