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let-down reflex

   Also found in: Wikipedia 0.01 sec.
let-down reflex.
let-down reflex
Obstetrics A physiologic postpartum response evoked by sucking–or negative mechanical pressure on the ♀ nipple or by psychologic stimuli, causing the release–'let-down' of breast milk in a nursing mother. See Breast milk.


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As the baby suckles at the breast (or the suction of the pump begins), a signal is sent from the breast to the brain to release oxytocin, which initiates the milk ejection or let-down reflex and causes the milk to flow.
 
 
 
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