Answer: Prolactin
Step-by-step explanation:
By the 5-6 month of pregnancy the breasts becomes ready to produce milk or colostrum. During the late stages of pregnancy, the women breast enter into the lactogenesis first stage. The level of prolactin rises. After birth the prolactin levels remains high the breast is stimulated. The release of prolactin triggers the cells present in the alveoli of the breast to secrete milk.