This is The Guardian.

Hi, I'm Shiuing Kala, and I'm Lucy Osborne.

You're listening to The Birth Keepers, a new six-part series from The Guardian Investigates.

Just before we start, this series contains references to baby loss and maternal harm.

That video we told you about at the end of episode four, it marked a new chapter in our investigation.

Shrin and I had been monitoring FBS for months, but after watching that video, we dropped everything else, all our other

stories, that image was all we could think about. We started making calls, we hit the road.

So we're here in Omaha, in the Midwest of America.

Traveling around the United States.

It's just all farms, isn't it?

It's just agricultural.

Yeah.

I'm just driving down this dirt right now.

We wanted to find out how many people have been influenced by FBS. Like, I just, every time you get that message of somebody, like, from a source saying,

oh, there's been another stillbirth.

Yeah.

You just have this feeling of like, fear.

Like, I've never felt anything like it.

And what was the scale of the possible harm?

There's just this... this absolute trail of destruction.

We'd knocked on this door and once it opened,

there was no way of shutting it.

...