International Board of Certified Lactation Consultant (IBCLC) Practice Exam

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What hormonal influence does oxytocin have on breast function?

Stimulating milk production
Causing the let-down reflex
Promoting ductal growth
Inducing lactation initiation

The correct answer is: Causing the let-down reflex

Oxytocin plays a critical role in breast function, particularly in the process of milk ejection during breastfeeding. This hormone is released in response to suckling or when the baby is close to the mother. When oxytocin is released into the bloodstream, it causes the muscles around the alveoli (milk-producing glands) to contract, which helps push milk through the ducts towards the nipple. This process is commonly referred to as the let-down reflex. This hormone is essential for successful breastfeeding because without proper let-down, a mother might struggle to deliver milk to her infant, potentially affecting feeding dynamics and overall breastfeeding success. Understanding this mechanism highlights the importance of oxytocin in facilitating a positive breastfeeding experience.