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Influencers are questioning common guidance about breast milk. Here's what science says

The guidance over leftover breast milk says toss it after 2 hours. But a recent preprint study shared on social media has some people questioning that advice.

Copyright 2026 NPR

Maria Godoy
Maria Godoy is a senior science and health editor and correspondent with NPR News. Her reporting can be heard across NPR's news shows and podcasts, including NPR's Life Kit.
Ayesha Rascoe
Ayesha Rascoe is the host of Weekend Edition Sunday and the weekend host of Up First. As host of the morning news magazine show, she interviews newsmakers, entertainers, politicians and more about the stories that everyone is talking about or that everyone should be talking about.

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