What is a side effect of oxytocin during breastfeeding?

The correct answer highlights the role of oxytocin as a critical hormone in the breastfeeding process. During breastfeeding, oxytocin is released from the posterior pituitary gland in response to nipple stimulation. This hormone is responsible for the milk ejection reflex, also known as the let-down reflex, which allows milk stored in the alveoli of the breast to be pushed into the milk ducts and available for the infant. This action is essential for effective breastfeeding, ensuring the infant receives milk.

The other options do not align with the known effects of oxytocin during breastfeeding. Decreased milk production is not a recognized effect; in fact, oxytocin aids in the release of milk, promoting further milk production. While uterine contraction occurs due to oxytocin, this is more relevant in the context of labor and postpartum recovery rather than breastfeeding. Increased appetite doesn’t have a direct correlation with oxytocin's role during breastfeeding, making it an incorrect option in this context. Thus, the role of oxytocin in facilitating milk ejection is the most accurate side effect associated with its use during breastfeeding.