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The let-down reflex, also known as the milk ejection reflex, is primarily triggered by the hormone oxytocin, which is released in response to nipple stimulation during breastfeeding. When an infant suckles, sensory receptors in the nipple send signals to the brain, prompting the release of oxytocin from the pituitary gland. This hormone causes the smooth muscle cells around the milk-producing glands to contract, pushing milk into the ducts and making it available to the baby. Emotional factors, such as feeling relaxed or bonding with the baby, can also enhance this reflex.

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1mo ago

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