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

Breasts aren’t just big bags of milk, despite how they might look. Its more similar to sweat: produced on-demand, as needed. The act of nursing stimulates milk production, both in the short term, while the baby is actively feeding, and in the long term to keep the breasts producing milk until the baby is weaned.

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