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Human Microbiome May Be Seeded Before Birth

We are each home to about 100 trillion bacteria, which we carry with us from birth till death. But when Juliette C. Madan was trained as a neonatologist in the mid-2000s, her teachers told her in no uncertain terms that we only acquire those bacteria after we are born. “It was clear as day, we were told, that fetuses were sterile,” she said.

Dr. Madan is now an assistant professor of pediatrics at the Geisel School of Medicine at Dartmouth, and she’s come to a decidedly different view on the matter. “I think that the tenet that healthy fetuses are sterile is insane,” she said.

Dr. Madan and a number of other researchers are now convinced mothers seed their fetuses with microbes during pregnancy. They argue that this early inoculation may be important to the long-term health of babies. And manipulating these fetal microbes could open up new ways to treat medical conditions ranging from pre-term labor to allergies.

In 1900, the French pediatrician Henry Tissier declared unborn babies bacteria-free. Only when they started their journey down through the birth canal did they begin to get covered with microbes. The newborns then acquired more as they were handled and nursed.

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