Breast milk is produced in the alveoli, tiny clusters of milk-secreting cells within the mammary glands, and then moves through ducts to the lactiferous sinuses, where it is temporarily stored before being released during feeding. This system ensures that milk is readily available for the baby on demand, while also allowing the breasts to regulate production according to feeding frequency. Understanding this anatomy highlights the biological efficiency of lactation and the importance of proper breastfeeding techniques for effective milk removal and infant nutrition.