Mature Milk
photo by Jane Morton, MD
Once the milk "comes in" and the volume increases significantly (usually around the third post-partum day), the milk changes in appearance from the yellow, sticky colostrum to the more creamy, liquid mature milk. The exact appearance, though, changes even within a feeding. The milk expressed at the beginning of the feed will have a lower fat content (and appears thinner) than the milk expressed as the breast is progressively emptied. The later "hindmilk" has a high fat content and looks thicker and creamier.
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