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The main hormone involved with these uterus contractions is called oxytocin. It is primarily involved with the Letdown Reflex, which is the secretion of milk.
Breast milk has different components that contribute to immunological benefits including secretory immunoglobins, T-cell products, carrier proteins, histocompatibility antigens, and enzymes (including leukocyte enzymes.) Other benefits for the baby include nutritional, cognitive, and socioeconomic benefits. There is also an associated lower risk of Sudden Infant Death Syndrome (SIDS).

There are also benefits for the mother including hormonal, physical, and psychological benefits. Breastfeeding also stimulates a hormone that increases infertility, but it is not as effective as other birth control methods. Many women who breastfeed return to prepregnancy weight faster than those who do not breastfeed.

The 3 stages of lactogenesis:

1.) Lactogenesis 1
-Milk begins to form. Lactose and protein content increases. Suckling is not necessary for milk production during this stage.

2.) Lactogenesis 2
-Begins 2-5 days later. There is increased blood flow to the mammary gland.

3.) Lactogenesis 3
-Begins about 10 days after birth. During this stage, milk production becomes stable.

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