ELI5 How does breast milk not get sour in breasts?

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My wife breastfeeds our newborn, and after (inadvertently) leaving milk out on the counter for 2 hours, I got to wonder: how is it that she can not feed/pump for 6 hours while our child sleeps, and still have good milk? Body temp is 37°C and room temp is around 20°C.

In: Biology

5 Answers

Anonymous 0 Comments

The ducts in the breast are an isolated environment where the bacteria that would cause it to “sour” are unable to survive and do so. Once outside the breast it is vulnerable to all the bacteria in the air and can sour fairly quickly as a result.

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