oxytocin
The hormone "oxytocin" is responsible for milk letdown.
Oxytocin is the hormone required for milk letdown. It is released from the pituitary gland in response to suckling or breast stimulation.
It can be, does this occur on letdown, if so it might be related to the tingling some mothers get when milk is letdown.
Prolactin
Prolactin is a hormone that is primarily produced in the anterior pituitary gland and its target tissue is the mammary glands and stimulates the letdown, or secretion, of milk from the breasts for nursing an infant,
Another main hormone that causes milk production and nursing is oxytocin. It is the same feel-good hormone that’s released during breast stimulation and sex.
Oxytocin is a hormone that is released during breastfeeding and plays a crucial role in the process of milk ejection. It causes the muscles around the milk ducts in the breast to contract, pushing the milk out into the nipple for the baby to feed.
The prolactin hormone helps in producing milk.
prolactin - anterior pituitary gland oxytocin - posterior pituitary gland
Oxytocin
Milk has hormones in :D
The hormone prolactin will cause milk production.