Quote:
Originally Posted by Bokonon 
Keeping your breasts empty by nursing or pumping frequently will just ramp up production of milk, which won't really change the proportion of foremilk to hindmilk.
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That's not true.
http://www.kellymom.com/bf/supply/fo...-hindmilk.html
Quote:
Research from Peter Hartmann's group tells us that fat content of the milk is primarily determined by the emptiness of the breast -- the less milk in the breast, the higher the fat content.
A woman's breast really only makes one type of milk, the higher-fat milk that we typically think of as hindmilk. As milk is produced in the breast, the fat globules in the milk tend to stick to each other and to the walls of the alveoli (where the milk is made). Between feedings, milk collects in mom's breasts and gradually moves out toward the nipple, leaving more and more of the fat "stuck" further back in the milk ducts. The more time between feedings, the lower the fat content of the foremilk available to baby at the beginning of the feeding. |
All milk produced by the breast, when it's first "let down," is full-fat milk, the milk we call hindmilk. Between letdowns, milk seeps down slowly to be stored behind the nipple. As the milk sits there, fat is reabsorbed, so that the milk that is right behind the nipple when baby starts to suckle is lower in fat. The longer it sits there, the less fatty it is. When milk "lets down," that milk mixes with the milk being stored (that seeped down between feeds) to make what we call "foremilk," or lower-fat milk.
If baby feeds frequently (and in some cultures, three to five feeds an hour is normal, and incidentally in these cultures, breastfeeding "problems" are almost unknown), then there's no stored milk behind the nipple when baby elicits a letdown, so that there's less of what is commonly called "foremilk."
So it is in fact true that frequent feeds will in fact result in baby getting on average higher-fat milk.
The breastfeeding chapter in Our Babies, Ourselves is where I first learned about this stuff.