Oxytocin hormone is also known as 'milk ejection hormone' because oxytocin induces contractions of the mammary gland muscles and helps in the flow of stored milk from the mammary glands to the mouth of the suckling infant. Oxytocin contracts the smooth muscles of uterus and mammary glands. Uterine contractions, stimulated by oxytocin at the end of pregnancy, help in child-birth. That is why, it is also called 'birth hormone'. Prolactin or lactogenic hormone or luteotrophic hormone (LTH) is secreted by the anterior pituitary which helps in the growth of mammary glands during pregnancy and initiates the secretion of milk after child-birth.

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