Letdown, as known as Milk Ejection Reflex or (MER), is a reflex that makes breastmilk flow. When a baby begins to suck, two hormones – prolactin and oxytocin – are released into your bloodstream. Prolactin helps create milk, while oxytocin causes the flow. Many parents report feeling little to nothing during letdown, while others associate it with negative emotions, a sensation known as D-MER. Whether you feel tingles or nada, this video will give you the lowdown.

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