When you breastfeed your baby, one of the hormones that is released into your body is Oxytocin. Oxytocin causes “smooth” muscle to contract, such as the sacs of milk in your breasts. When your milk sacs are contracted, the milk shifts position to the front of the breast, where it is readily available for your baby. The contraction is something you will be familiar with when you are nursing, and can be described as a “letdown” reflex.
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