I just went back and listened to this interview I did on “Radiolab” with Robert Krulwich a couple years ago. It’s about the life within us. I led Robert on a quick tour through our gut, stopping to describe a few of the many species that lurk inside our bodies.
It all still holds true, I think–except for one thing I say at 3:02.
It’s at that point that I say that in the womb, we’re sterile. Only as we’re being born, I inform Robert, do we start to getting inoculated with microbes.
I thought I was right at the time. Scientist after scientist told me that. I read it in scientific reviews.
But now a number of scientists are having some serious doubts about sterile fetuses. In fact, mothers might be seeding their babies in the womb, bestowing on them the friends that will help them get through pregnancy safely and get off to a good start in life.
If Krulwich ever asks me again about the microbiome, I’ve got something to add.