Anatomy & Physiology: Milk Composition

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Anatomy & Physiology Topics
Table of Contents
Pre module evaluation
Structure of the Human Breast
Physiology of Breastfeeding
Milk Composition
Mature Milk Components
Supplements
Post module evaluation
References

Breast milk changes in appearance and composition during the months of breastfeeding as the photo below illustrates.

Breast Milk at 3, 7, 25 and 84 days post-partum

(Photo courtesy of Wellstart International)

Colostrum is a thick, yellowish milk that is secreted by a woman's breast in the first several days after delivery. It has increased concentration of calcium, potassium, proteins, fat-soluble vitamins, minerals and antibodies. The volume is approximately 100 cc's (3 oz.) in a 24-hour period. Due to its high concentration of antibodies, this milk is particularly valuable for infants in preventing infection.

Transitional milk is secreted between about four days and ten days postpartum. It is intermediate in composition in between colostrum and mature milk. The volume increases during this time.



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email -- Copyright 1998 Mary O'Connor MD, MPH -- Unauthorized use prohibited