“Bt can be found almost everywhere in the world. Surveys have indicated that Bt is distributed in the soil sparsely but frequently worldwide. Bt has been found in all types of terrain, including beaches, desert, and tundra habitats.”
So how many unborn babies were contaminated with bt 20 years ago, oops, we don’t know because no one tested.
These kind of studies which may even be true are just to cause hysteria by people with an agenda.