Breastmilk. Research says it’s the best, so why did the U.S. threaten to shut down a breastfeeding proposal at the World Health Assembly? Vox’s Julia Belluz says it all boils down to baby formula, the $70 billion industry lurking in the shadows. ******************************************* Are you pregnant? Have you ever been? Vox wants to provide more explainers on women's health and would love your help. You can fill out the survey here: http://bit.ly/voxpregnancy

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