What hormones that stimulates the growth of the mammary glands and the initial steps of the milk -secreting process?

The hormones that stimulate the growth of the mammary glands and the initial steps of the milk-secreting process are estrogen and progesterone. These hormones are primarily produced by the ovaries and play a crucial role in preparing the breasts for lactation during pregnancy. Additionally, prolactin, a hormone produced by the pituitary gland, also plays a key role in stimulating milk production and secretion.