Milk release positive feedback.
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   A  baby  suckling at the nipple sends nerve signals to sensory neurons
   in the hypothalamus.
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   Oxytocin  is  made by neurosecretory cells and stored in the posterior
   pituitary.
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   When  oxytocin  circulates  to target cells in the breast, it triggers
   smooth muscle contraction and release of milk.
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   The milk encourages more suckling at the nipple.
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   The  anterior  pituitary  also  releases  prolactin,  stimulating milk
   production in the breast.
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