Is breast milk actually the mother's blood?

Breast milk is not directly produced from the mother's blood, but it is related to blood.

Breast milk is formed under the control of various hormones, such as prolactin and lactation inhibiting factor, by the mammary gland cells. These cells absorb nutrients such as proteins, fats, carbohydrates, vitamins, and minerals from the blood and then convert them into breast milk. It can be said that breast milk indirectly receives nutrients from the blood.

Breast milk mainly contains nutritional components such as whey protein, lactoferrin, and carbohydrates, which provide essential support for the infant's growth. Although the nutrients in breast milk originate from the blood, its composition and function are significantly different from those of blood after being transformed by the mammary glands.

Breast milk contains many active components such as abundant immunoglobulins, growth factors, and enzymes, which are beneficial for the establishment of the newborn's immune system, the development of the digestive tract, and brain development. Breastfeeding not only provides comprehensive nutrition for the baby but also enhances the bond between mother and baby.